diff --git a/Script.php b/Script.php
index d1921c7..154a144 100644
--- a/Script.php
+++ b/Script.php
@@ -1,5 +1,5 @@
 <?php
-    include 'NoDirectPhpAcess.php';
+include 'NoDirectPhpAcess.php';
 ?>
 
 <?php
@@ -17,21 +17,16 @@ include "get_mysql_credentials.php";
 $con = mysqli_connect("localhost",  $mysql_username, $mysql_password, "lrr");
 
 // Check connection
-if (mysqli_connect_errno())
-{
+if (mysqli_connect_errno()) {
     echo "Failed to connect to MySQL: " . mysqli_connect_error();
 }
 
-
 error_reporting(0);
 
-
-
-
-
 // #### FUNCTION CHECK FILE TYPES ////
 
-function is_valid_student_number($student_id) {
+function is_valid_student_number($student_id)
+{
     // zjnu student number has 12 digits, and starts with 20
     if (strlen($student_id) == 12  && is_numeric($student_id) == TRUE && substr($student_id, 0, 2) == "20")
         return TRUE;
@@ -40,45 +35,40 @@ function is_valid_student_number($student_id) {
 
 // ############################### SIGN UP ##################################
 if (!empty($_POST["frm_signup_1"])) {
-    
-    $student_id = trim( mysqli_real_escape_string($con, $_POST["student_id"]) );
+
+    $student_id = trim(mysqli_real_escape_string($con, $_POST["student_id"]));
 
     // validate student number
-    if (! is_valid_student_number($student_id)) {
+    if (!is_valid_student_number($student_id)) {
         $_SESSION["info_signup1"] = "Invalid student number.";
         header("Location: index.php");
-        return;       
+        return;
     }
 
     // Check if this student number is a legal one
-    $result = mysqli_query($con, "SELECT * FROM `students_data` WHERE Student_ID='$student_id'");   
-    if(mysqli_num_rows($result) == 0)
-    {
+    $result = mysqli_query($con, "SELECT * FROM `students_data` WHERE Student_ID='$student_id'");
+    if (mysqli_num_rows($result) == 0) {
         $_SESSION["info_signup1"] = "Your entered student number could not be verified.  Please contact Student Management Office <lanhui at zjnu.edu.cn>.  Thanks.";
-        header("Location: index.php");     
-        return;		
+        header("Location: index.php");
+        return;
     }
-   
+
     $result98 = mysqli_query($con, "SELECT * FROM `users_table` WHERE Student_ID='$student_id'");
-    if(mysqli_num_rows($result98) == 0)
-    {
+    if (mysqli_num_rows($result98) == 0) {
         $_SESSION['user_student_id'] = $student_id;
         header("Location: signup.php");
         return;
-    }
-    else
-    { 
+    } else {
         $_SESSION["info_signup1"] = "This Student ID is already in use! Please contact Student Management Office <lanhui at zjnu.edu.cn> for help.";
         header("Location: index.php");
-        return;		
-    } 
+        return;
+    }
 }
 
-
 // ############################### CREATE STUDENT USER ##################################
 if (!empty($_POST["frm_signup_2"])) {
     $fullname = mysqli_real_escape_string($con, $_POST["fullname"]);
-    $student_id = mysqli_real_escape_string ($con, $_POST["user_student_id"]);    
+    $student_id = mysqli_real_escape_string($con, $_POST["user_student_id"]);
     $email = mysqli_real_escape_string($con, $_POST["email"]);
     $password = mysqli_real_escape_string($con, $_POST["password"]);
     $confirmpassword = mysqli_real_escape_string($con, $_POST["confirmpassword"]);
@@ -87,7 +77,7 @@ if (!empty($_POST["frm_signup_2"])) {
     $_SESSION['user_email'] = $email;
 
     // check confirmed password
-    if ( strcasecmp( $password, $confirmpassword ) != 0 ){
+    if (strcasecmp($password, $confirmpassword) != 0) {
         $_SESSION['info_signup2'] = "Password confirmation failed.";
         $_SESSION['user_fullname'] = null;  // such that Header.php do not show the header information.        
         header("Location: signup.php");
@@ -100,7 +90,7 @@ if (!empty($_POST["frm_signup_2"])) {
         header("Location: signup.php");
         return;
     }
-   
+
     $upperLetter     = preg_match('@[A-Z]@',    $password);
     $smallLetter     = preg_match('@[a-z]@',    $password);
     $containsDigit   = preg_match('@[0-9]@',    $password);
@@ -108,7 +98,7 @@ if (!empty($_POST["frm_signup_2"])) {
     $containsAll = $upperLetter && $smallLetter && $containsDigit && $containsSpecial;
 
     // check for strong password
-    if(! $containsAll) {
+    if (!$containsAll) {
         $_SESSION['info_signup2'] = "Password must have at least characters that include lowercase letters, uppercase letters, numbers and sepcial characters (e.g., !?.,*^).";
         header("Location: signup.php");
         return;
@@ -116,43 +106,39 @@ if (!empty($_POST["frm_signup_2"])) {
 
     // check if email is taken
     $result = mysqli_query($con, "SELECT * FROM users_table WHERE email='$email'");
-    if(mysqli_num_rows($result) != 0)
-    {
-        $_SESSION["info_signup2"]="Email adress ".$email."  is already in use.";
+    if (mysqli_num_rows($result) != 0) {
+        $_SESSION["info_signup2"] = "Email adress " . $email . "  is already in use.";
         $_SESSION['user_fullname'] = null;
-        header("Location: signup.php"); 
-        return;       
+        header("Location: signup.php");
+        return;
     }
 
     // apply password_hash()
     $password_hash = password_hash($password, PASSWORD_DEFAULT);
-    $sql= "INSERT INTO `users_table`(`Email`, `Password`, `Full_Name`, `UserType`, `Student_ID`) VALUES "
+    $sql = "INSERT INTO `users_table`(`Email`, `Password`, `Full_Name`, `UserType`, `Student_ID`) VALUES "
         . "('$email','$password_hash','$fullname','Student','$student_id')";
-    
+
     if ($con->query($sql) === TRUE) {
-        header("Location: Courses.php");    
+        header("Location: Courses.php");
     } else {
         echo "Something really bad (SQL insertion error) happened during sign up.";
     }
 }
 
-    
-
-
 // ################################ LOGIN  #####################################
 
 if (!empty($_POST["frm_login"])) {
-    
+
     $user = mysqli_real_escape_string($con, $_POST["user"]); // user could be a 12-digit student number or an email address
     $is_student_number = 0;
-  
+
     // Validate student number
-    if ( is_valid_student_number($user) ) {
-        $is_student_number = 1;        
+    if (is_valid_student_number($user)) {
+        $is_student_number = 1;
     }
-    
+
     // Validate email address if what provided is not a student number
-    if (! $is_student_number && !filter_var($user, FILTER_VALIDATE_EMAIL)) {
+    if (!$is_student_number && !filter_var($user, FILTER_VALIDATE_EMAIL)) {
         $_SESSION["info_login"] = "Invalid email address: " . "$user";
         header("Location: index.php");
         return;
@@ -160,208 +146,169 @@ if (!empty($_POST["frm_login"])) {
 
     $password = mysqli_real_escape_string($con, $_POST["password"]);
     $result = mysqli_query($con, "SELECT * FROM users_table WHERE (Student_ID='$user') OR (Email='$user')");
-    if(mysqli_num_rows($result) == 0)
-    {
+    if (mysqli_num_rows($result) == 0) {
         $_SESSION["info_login"] = "Inavlid user name information.";
         echo $_SESSION["info_login"];
-        header("Location: index.php");        
-    }
-    else 
-    { 
-        while($row = mysqli_fetch_assoc($result)) {
+        header("Location: index.php");
+    } else {
+        while ($row = mysqli_fetch_assoc($result)) {
             //  verify the hashed password and unhashed password
             $sha512pass = hash('sha512', $password); // for backward compatibility.  Old passwords were hashed using SHA512 algorithm.
-            if(password_verify($password, $row["Password"]) or $sha512pass == $row["HashPassword"]) {
+            if (password_verify($password, $row["Password"]) or $sha512pass == $row["HashPassword"]) {
 
                 $_SESSION['user_id'] = $row['User_ID'];
                 $_SESSION['user_email'] = $row['Email'];
                 $_SESSION['user_student_id'] = $row['Student_ID'];
                 $_SESSION['user_type'] = $row['UserType'];
                 $_SESSION['user_fullname'] = $row['Full_Name'];
-     
-                if( $_SESSION['user_type'] == "Student")
-                {
-                    header("Location: Courses.php");
-                }     
 
-                if( $_SESSION['user_type'] == "Lecturer")
-                {
+                if ($_SESSION['user_type'] == "Student") {
                     header("Location: Courses.php");
                 }
-     
-                if( $_SESSION['user_type'] == "TA")
-                {
+
+                if ($_SESSION['user_type'] == "Lecturer") {
                     header("Location: Courses.php");
                 }
-      
-                if( $_SESSION['user_type'] == "Admin")
-                {
+
+                if ($_SESSION['user_type'] == "TA") {
+                    header("Location: Courses.php");
+                }
+
+                if ($_SESSION['user_type'] == "Admin") {
                     header("Location: Admin.php");
                 }
-            //  report wrong pass if not correct
+                //  report wrong pass if not correct
             } else {
                 $_SESSION["wrong_pass"] = "Wrong Password.";
-                header("Location: index.php");  
+                header("Location: index.php");
             }
         }
     }
 }
 
-
-
-
-
 // ################################ Recover Password  #####################################
 
 if (!empty($_POST["frm_recover_password"])) {
 
-    $student_id = mysqli_real_escape_string($con,$_POST["sno"]);
-    $email = mysqli_real_escape_string($con,$_POST["email"]);
+    $student_id = mysqli_real_escape_string($con, $_POST["sno"]);
+    $email = mysqli_real_escape_string($con, $_POST["email"]);
 
     // validate student number
     if (strlen($student_id) != 12  || is_numeric($student_id) == FALSE) {
-        $_SESSION["info_recover_password"]="Invalid student number.";
+        $_SESSION["info_recover_password"] = "Invalid student number.";
         #echo "Invalid student number.";
         header("Location: recover_password.php");
-        return;       
+        return;
     }
 
     // validate email
     if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
-        $_SESSION["info_recover_password"]="Invalid email address.";
+        $_SESSION["info_recover_password"] = "Invalid email address.";
         // echo "Invalid email address.";
         header("Location: recover_password.php");
         return;
     }
 
-
     $result = mysqli_query($con, "SELECT * FROM users_table WHERE Email='$email' and Student_ID='$student_id'");
-    if(mysqli_num_rows($result)==0)
-    {
-        $_SESSION["info_recover_password"]="Email address is not recognised.";
+    if (mysqli_num_rows($result) == 0) {
+        $_SESSION["info_recover_password"] = "Email address is not recognised.";
         $_SESSION["info_recover_password"] = "Identity not recognized.  Try again or send an inquiry email message to lanhui at zjnu.edu.cn.";
-        header("Location: recover_password.php");        
-    } else 
-    {
+        header("Location: recover_password.php");
+    } else {
         $result = mysqli_query($con, "DELETE FROM users_table WHERE Email='$email' and Student_ID='$student_id'");
         header("Location: signup.php");
     }
 }
 
-
-
-
-
 // ################################ RESET Password  #####################################
 
 if (!empty($_POST["frm_reset_password"])) {
-    $password=mysqli_real_escape_string($con,$_POST["password"]);
-    $token=mysqli_real_escape_string($con,$_POST["token"]);
-    $email=mysqli_real_escape_string($con,$_POST["email"]);
-    $result = mysqli_query($con,
-                           "SELECT * FROM Users_Table WHERE email='$email'");
-    if(mysqli_num_rows($result)==0)
-    {
-    
+    $password = mysqli_real_escape_string($con, $_POST["password"]);
+    $token = mysqli_real_escape_string($con, $_POST["token"]);
+    $email = mysqli_real_escape_string($con, $_POST["email"]);
+    $result = mysqli_query(
+        $con,
+        "SELECT * FROM Users_Table WHERE email='$email'"
+    );
+    if (mysqli_num_rows($result) == 0) {
+
         echo "invalid email";
         return;
-       
-    }
-    else 
-    { 
-        while($row = mysqli_fetch_assoc($result)) {
+    } else {
+        while ($row = mysqli_fetch_assoc($result)) {
 
-            $userid=$row['User_ID'];
+            $userid = $row['User_ID'];
 
-            $email=$row['Email'];
-            $id=$row['Student_ID'];
-    
-            $user_token=$userid*$userid*$userid+$userid*0.00343;
-            if($user_token==$token)
-            {
+            $email = $row['Email'];
+            $id = $row['Student_ID'];
+
+            $user_token = $userid * $userid * $userid + $userid * 0.00343;
+            if ($user_token == $token) {
                 // Password Update
 
                 // Password Update
-                $hashed_password=hash('sha512', $password);
-                $sql= "UPDATE users_table set HashPassword='$hashed_password' where User_ID=$userid;";
+                $hashed_password = hash('sha512', $password);
+                $sql = "UPDATE users_table set HashPassword='$hashed_password' where User_ID=$userid;";
                 if ($con->query($sql) === TRUE) {
-       
+
                     error_reporting(0);
 
-                    $_SESSION["info_login"]=" Password changed successfully , you can login now with your new password ";
+                    $_SESSION["info_login"] = " Password changed successfully , you can login now with your new password ";
                     header("Location: index.php");
-                                   
-                }
-                else {
+                } else {
                     echo "Error: " . $sql . "<br>" . $con->error;
                 }
-
-            } else
-            {
+            } else {
                 echo "Invalid Token ";
             }
-
-    
-
-
         }
     }
 }
 
-
-
-
-
 // ############################### CREATE Lecturer/TA USER ##################################
 if (!empty($_POST["frm_createlecturrer"])) {
-    $email=mysqli_real_escape_string($con,$_POST["email"]);
-    $fullname=mysqli_real_escape_string($con,$_POST["fullname"]);
-    $type=mysqli_real_escape_string($con,$_POST["type"]);
-    $password=$passport;
+    $email = mysqli_real_escape_string($con, $_POST["email"]);
+    $fullname = mysqli_real_escape_string($con, $_POST["fullname"]);
+    $type = mysqli_real_escape_string($con, $_POST["type"]);
+    $password = $passport;
     // check if email is taken
-    $result = mysqli_query($con,
-                           "SELECT * FROM Users_Table WHERE email='$email'");
-    if(mysqli_num_rows($result)!=0)
-    {
-        $_SESSION["info_Admin_Users"]="Email adress : ".$email." is already in use.";
-        header("Location: Admin.php");        
+    $result = mysqli_query(
+        $con,
+        "SELECT * FROM Users_Table WHERE email='$email'"
+    );
+    if (mysqli_num_rows($result) != 0) {
+        $_SESSION["info_Admin_Users"] = "Email adress : " . $email . " is already in use.";
+        header("Location: Admin.php");
     }
-    $sql= "INSERT INTO `users_table`(`Email`, `Password`, `Full_Name`, `UserType`) VALUES "
+    $sql = "INSERT INTO `users_table`(`Email`, `Password`, `Full_Name`, `UserType`) VALUES "
         . "('$email','$password','$fullname','$type')";
-    
+
     if ($con->query($sql) === TRUE) {
-        $_SESSION["info_Admin_Users"]=$type." user Created successfully : email ".$email." and $password as Password.";
-        header("Location: Admin.php"); 
-    
+        $_SESSION["info_Admin_Users"] = $type . " user Created successfully : email " . $email . " and $password as Password.";
+        header("Location: Admin.php");
     } else {
         echo "Error: " . $sql . "<br>" . $con->error;
     }
 }
 
-
-
-
-
 // #### FUNCTION CHECK FILE TYPES ////
 
-function is_valid_file_format($file) {
- 
- 
-    $allowed =  array('pdf', 'rtf', 'jpg','png', 'doc', 'docx', 'xls', 'xlsx','sql','txt','md','py','css','html',
-                      'cvc','c','class','cpp','h','java','sh','swift','zip','rar','ods','xlr','bak','ico','swf');
-   
+function is_valid_file_format($file)
+{
+
+    $allowed =  array(
+        'pdf', 'rtf', 'jpg', 'png', 'doc', 'docx', 'xls', 'xlsx', 'sql', 'txt', 'md', 'py', 'css', 'html',
+        'cvc', 'c', 'class', 'cpp', 'h', 'java', 'sh', 'swift', 'zip', 'rar', 'ods', 'xlr', 'bak', 'ico', 'swf'
+    );
+
     $filename = $_FILES[$file]['name'];
     $ext = pathinfo($filename, PATHINFO_EXTENSION);
-    $result = in_array($ext,$allowed);
+    $result = in_array($ext, $allowed);
     return $result;
 }
 
-
-
-
-
 // #### FUNCTION CREATE DIRECTORIES  ////
- 
+
 function Create_dir($upPath)
 {
     try {
@@ -369,21 +316,19 @@ function Create_dir($upPath)
         $tags = explode('/', $upPath);            // explode the full path
         $mkDir = "";
 
-        foreach($tags as $folder) {          
-            $mkDir = $mkDir . $folder ."/";   // make one directory join one other for the nest directory to make
-            echo '"'.$mkDir.'"<br/>';         // this will show the directory created each time
-            if(!is_dir($mkDir)) {             // check if directory exist or not
+        foreach ($tags as $folder) {
+            $mkDir = $mkDir . $folder . "/";   // make one directory join one other for the nest directory to make
+            echo '"' . $mkDir . '"<br/>';         // this will show the directory created each time
+            if (!is_dir($mkDir)) {             // check if directory exist or not
                 mkdir($mkDir, 0777);          // if not exist then make the directory
             }
-        }	
-    }
-    catch (Exception $e) {
+        }
+    } catch (Exception $e) {
         return FALSE;
     }
     return $upPath;
 }
 
-
 function mkdirs($path)
 {
     if (file_exists($path))
@@ -395,255 +340,230 @@ function mkdirs($path)
     return $result;
 }
 
-
-
 // ############################### #Post Assignment ##################################
 if (!empty($_POST["frm_uploadlab"])) {
-        
-     
-        
-    $course_id=mysqli_real_escape_string($con,$_POST["course_id"]);
-    $deadlinedate=$_POST["deadlinedate"];
-    $deadlinetime=$_POST["deadlinetime"];
-    $instructions=mysqli_real_escape_string($con,$_POST["instructions"]);
-    $title=mysqli_real_escape_string($con,$_POST["title"]);
-    $marks=mysqli_real_escape_string($con,$_POST["marks"]);
+
+    $course_id = mysqli_real_escape_string($con, $_POST["course_id"]);
+    $deadlinedate = $_POST["deadlinedate"];
+    $deadlinetime = $_POST["deadlinetime"];
+    $instructions = mysqli_real_escape_string($con, $_POST["instructions"]);
+    $title = mysqli_real_escape_string($con, $_POST["title"]);
+    $marks = mysqli_real_escape_string($con, $_POST["marks"]);
     //  $url=mysqli_real_escape_string($con,$_POST["url"]);
     $url = $_SESSION['url']; //using real_escape_string was failing to redirect to the main page
     $type = mysqli_real_escape_string($con, $_POST["type"]);
-         
-         
-    $deadline = $deadlinedate." ".$deadlinetime;
+
+    $deadline = $deadlinedate . " " . $deadlinetime;
     $date =  date("Y-m-d H:i:s");
-            
-       
-       
+
     // GET UPLOADED FILES
-       
-    $target_dir = Create_dir("Lab_Report_Assignments/".$title."/");
 
+    $target_dir = Create_dir("Lab_Report_Assignments/" . $title . "/");
 
-    $rnd=rand(10,1000);
-    $rnd=""; // no more required , creating folder for each lab
-    $targetfile  = $target_dir.$rnd.$_FILES['attachment1']['name'];
-    $targetfile2 = $target_dir.$rnd.$_FILES['attachment2']['name'];
-    $targetfile3 = $target_dir.$rnd.$_FILES['attachment3']['name'];
-    $targetfile4 = $target_dir.$rnd.$_FILES['attachment4']['name'];
-             
-          
+    $rnd = rand(10, 1000);
+    $rnd = ""; // no more required , creating folder for each lab
+    $targetfile  = $target_dir . $rnd . $_FILES['attachment1']['name'];
+    $targetfile2 = $target_dir . $rnd . $_FILES['attachment2']['name'];
+    $targetfile3 = $target_dir . $rnd . $_FILES['attachment3']['name'];
+    $targetfile4 = $target_dir . $rnd . $_FILES['attachment4']['name'];
 
-    $count=0;           
-           
- 
-    if(!is_valid_file_format("attachment1") && $_FILES["attachment1"]["name"]!="")
-    {
+    $count = 0;
+
+    if (!is_valid_file_format("attachment1") && $_FILES["attachment1"]["name"] != "") {
         echo "Invalid File Type for Attachment 1";
         return;
     }
-    if(!is_valid_file_format("attachment2") && $_FILES["attachment2"]["name"]!="")
-    {
+    if (!is_valid_file_format("attachment2") && $_FILES["attachment2"]["name"] != "") {
         echo "Invalid File Type for Attachment 2";
         return;
     }
-    if(!is_valid_file_format("attachment3") && $_FILES["attachment3"]["name"]!="")
-    {
+    if (!is_valid_file_format("attachment3") && $_FILES["attachment3"]["name"] != "") {
         echo "Invalid File Type for Attachment 3";
         return;
     }
-  
+
     // use 4 for missing file
 
     if (move_uploaded_file($_FILES['attachment1']['tmp_name'], $targetfile)) {
         $count++;
-    } else { 
+    } else {
         echo $_FILES['attachment1']['error'];
     }
-  
+
     if (move_uploaded_file($_FILES['attachment2']['tmp_name'], $targetfile2)) {
         $count++;
-    } else { 
+    } else {
         echo $_FILES['attachment2']['error'];
     }
-  
+
     if (move_uploaded_file($_FILES['attachment3']['tmp_name'], $targetfile3)) {
         $count++;
-    } else { 
+    } else {
         echo $_FILES['attachment3']['error'];
     }
-  
+
     if (move_uploaded_file($_FILES['attachment4']['tmp_name'], $targetfile4)) {
         $count++;
-    } else { 
+    } else {
         echo $_FILES['attachment4']['error'];
     }
-  
-  
-    echo $count." File(s) uploaded";
-  
+
+    echo $count . " File(s) uploaded";
+
     //CLEAN
-    $targetfile="";
-    $targetfile2="";
-    $targetfile3="";
-    $targetfile4="";
-      
-    if($_FILES['attachment1']['name']!=""){   $targetfile  = "/".$title."/".$_FILES['attachment1']['name']; }
-    if($_FILES['attachment2']['name']!=""){   $targetfile2 = "/".$title."/".$_FILES['attachment2']['name']; }
-    if($_FILES['attachment3']['name']!=""){   $targetfile3 = "/".$title."/".$_FILES['attachment3']['name']; }
-    if($_FILES['attachment4']['name']!=""){   $targetfile4 = "/".$title."/".$_FILES['attachment4']['name']; }
-        
-    $sql="INSERT INTO `lab_reports_table`(`Course_ID`, `Posted_Date`, `Deadline`, `Instructions`,
+    $targetfile = "";
+    $targetfile2 = "";
+    $targetfile3 = "";
+    $targetfile4 = "";
+
+    if ($_FILES['attachment1']['name'] != "") {
+        $targetfile  = "/" . $title . "/" . $_FILES['attachment1']['name'];
+    }
+    if ($_FILES['attachment2']['name'] != "") {
+        $targetfile2 = "/" . $title . "/" . $_FILES['attachment2']['name'];
+    }
+    if ($_FILES['attachment3']['name'] != "") {
+        $targetfile3 = "/" . $title . "/" . $_FILES['attachment3']['name'];
+    }
+    if ($_FILES['attachment4']['name'] != "") {
+        $targetfile4 = "/" . $title . "/" . $_FILES['attachment4']['name'];
+    }
+
+    $sql = "INSERT INTO `lab_reports_table`(`Course_ID`, `Posted_Date`, `Deadline`, `Instructions`,
                      `Title`, `Attachment_link_1`, `Attachment_link_2`, `Attachment_link_3`, `Attachment_link_4`,Marks,Type) 
                      VALUES ('$course_id','$date','$deadline','$instructions','$title','$targetfile','$targetfile2','$targetfile3','$targetfile3',$marks,'$type')";
-      
-      
-    
+
     if ($con->query($sql) === TRUE) {
-       
-        $_SESSION["info_courses"] = $type." lab report assignment posted successfully.";
-        header("Location: Courses.php?course=".$url); 
-   
+
+        $_SESSION["info_courses"] = $type . " lab report assignment posted successfully.";
+        header("Location: Courses.php?course=" . $url);
     } else {
         echo "Error: " . $sql . "<br>" . $con->error;
     }
 }
 
-
-
-
-
 function checksize($file)
 {
-    $result = $_FILES["$file"]['size']/(1024*1024);
-      
-    if($result > 1)
-    {
+    $result = $_FILES["$file"]['size'] / (1024 * 1024);
+
+    if ($result > 1) {
         return FALSE;
     }
     return TRUE;
 }
- 
- 
- 
+
 // ############################### Submit Assignment ##################################
 if (!empty($_POST["frm_submitlab"])) {
-        
+
     $lab_id = mysqli_real_escape_string($con, $_POST["lab_id"]);
     $student_id = $_POST["student_id"];
     $group_id = $_POST["group_id"];
-  
+
     $instructions = mysqli_real_escape_string($con, $_POST["instructions"]);
     $title = mysqli_real_escape_string($con, $_POST["title"]);
-    
+
     $url = mysqli_real_escape_string($con, $_POST["url"]);
-    
-    $deadline = $deadlinedate." ".$deadlinetime;
+
+    $deadline = $deadlinedate . " " . $deadlinetime;
     $date = date("Y-m-d H:i:s");
-    
+
     // GET UPLOADED FILES
-    $labName = mysqli_query($con,"SELECT * FROM `lab_reports_table` WHERE Lab_Report_ID=$lab_id");
-    while($row = mysqli_fetch_assoc($labName)) 
-    {
+    $labName = mysqli_query($con, "SELECT * FROM `lab_reports_table` WHERE Lab_Report_ID=$lab_id");
+    while ($row = mysqli_fetch_assoc($labName)) {
         $lab_name = $row['Title'];
         $_SESSION['Sub_Type'] = $row['Type']; // submission type, either Individual or Group
-    } 
+    }
 
     $upload_folder = "Lab_Report_Submisions"; // old place for storing students' submissions
     $upload_folder = "./../../lrr_submission";
-    $target_dir = mkdirs($upload_folder."/".$student_id."/".$url."/".$lab_name."/"); # url is actually course code plus academic year, e.g., CSC3122020
-    $targetfile  = $target_dir.$_FILES['attachment1']['name'];
-    $targetfile2 = $target_dir.$_FILES['attachment2']['name'];
-    $targetfile3 = $target_dir.$_FILES['attachment3']['name'];
-    $targetfile4 = $target_dir.$_FILES['attachment4']['name'];
-          
+    $target_dir = mkdirs($upload_folder . "/" . $student_id . "/" . $url . "/" . $lab_name . "/"); # url is actually course code plus academic year, e.g., CSC3122020
+    $targetfile  = $target_dir . $_FILES['attachment1']['name'];
+    $targetfile2 = $target_dir . $_FILES['attachment2']['name'];
+    $targetfile3 = $target_dir . $_FILES['attachment3']['name'];
+    $targetfile4 = $target_dir . $_FILES['attachment4']['name'];
+
     $count = 0;
-        
+
     //check zise
-    if(!checksize("attachment1"))
-    {
+    if (!checksize("attachment1")) {
         echo "1 MB is the maximum file size allowed";
         return;
     }
-    if(!checksize("attachment2") && $_FILES["attachment2"]["name"] != "")
-    {
+    if (!checksize("attachment2") && $_FILES["attachment2"]["name"] != "") {
         echo "1 MB is the maximum file size allowed";
         return;
     }
-    if(!checksize("attachment3") && $_FILES["attachment3"]["name"] != "")
-    {
+    if (!checksize("attachment3") && $_FILES["attachment3"]["name"] != "") {
         echo "1 MB is the maximum file size allowed";
         return;
     }
 
-
-    
-    if(!is_valid_file_format("attachment1"))
-    {
+    if (!is_valid_file_format("attachment1")) {
         echo "Invalid File Type for Attachment 1";
         return;
     }
-    if(!is_valid_file_format("attachment2") && $_FILES["attachment2"]["name"] != "")
-    {
+    if (!is_valid_file_format("attachment2") && $_FILES["attachment2"]["name"] != "") {
         echo "Invalid File Type for Attachment 2";
         return;
     }
-    if(!is_valid_file_format("attachment3") && $_FILES["attachment3"]["name"] != "")
-    {
+    if (!is_valid_file_format("attachment3") && $_FILES["attachment3"]["name"] != "") {
         echo "Invalid File Type for Attachment 3";
         return;
     }
 
-    if($_FILES["attachment1"]["error"] != 0) {
+    if ($_FILES["attachment1"]["error"] != 0) {
         echo "Error when uploading the file.";
         return;
-    } 
+    }
 
     // use 4 for missing file
 
     if (move_uploaded_file($_FILES['attachment1']['tmp_name'], $targetfile)) {
         $count++;
-    } else { 
+    } else {
         echo $_FILES['attachment1']['error'];
     }
 
     if (move_uploaded_file($_FILES['attachment2']['tmp_name'], $targetfile2)) {
         $count++;
-    } else { 
+    } else {
         echo $_FILES['attachment2']['error'];
     }
 
     if (move_uploaded_file($_FILES['attachment3']['tmp_name'], $targetfile3)) {
         $count++;
-    } else { 
+    } else {
         echo $_FILES['attachment3']['error'];
     }
 
     if (move_uploaded_file($_FILES['attachment4']['tmp_name'], $targetfile4)) {
         $count++;
-    } else { 
+    } else {
         echo $_FILES['attachment4']['error'];
     }
 
-
-    echo $count." File(s) uploaded";
+    echo $count . " File(s) uploaded";
 
     //CLEAN
     $targetfile1 = "";
     $targetfile2 = "";
-    $targetfile3 = "";  
+    $targetfile3 = "";
     $targetfile4 = "";
 
-    if(strlen($_FILES['attachment1']['name']) > 2 ) { // why greater than 2???
-        $targetfile = "/".$student_id."/".$url."/".$lab_name."/".rawurlencode($_FILES['attachment1']['name']);
+    if (strlen($_FILES['attachment1']['name']) > 2) { // why greater than 2???
+        $targetfile = "/" . $student_id . "/" . $url . "/" . $lab_name . "/" . rawurlencode($_FILES['attachment1']['name']);
     }
-   
-    if(strlen($_FILES['attachment2']['name']) > 2 ) {
-        $targetfile2 = "/".$student_id."/".$url."/".$lab_name."/".rawurlencode($_FILES['attachment2']['name']); }
- 
-    if(strlen($_FILES['attachment3']['name']) > 2 ) {
-        $targetfile3 = "/".$student_id."/".$url."/".$lab_name."/".rawurlencode($_FILES['attachment3']['name']);}
-   
-    if(strlen($_FILES['attachment4']['name']) > 2 ) {
-        $targetfile4 = "/".$student_id."/".$url."/".$lab_name."/".rawurlencode($_FILES['attachment4']['name']);
+
+    if (strlen($_FILES['attachment2']['name']) > 2) {
+        $targetfile2 = "/" . $student_id . "/" . $url . "/" . $lab_name . "/" . rawurlencode($_FILES['attachment2']['name']);
+    }
+
+    if (strlen($_FILES['attachment3']['name']) > 2) {
+        $targetfile3 = "/" . $student_id . "/" . $url . "/" . $lab_name . "/" . rawurlencode($_FILES['attachment3']['name']);
+    }
+
+    if (strlen($_FILES['attachment4']['name']) > 2) {
+        $targetfile4 = "/" . $student_id . "/" . $url . "/" . $lab_name . "/" . rawurlencode($_FILES['attachment4']['name']);
     }
 
     // When $group_id is not properly initialized, use integer 0 as its value.
@@ -656,487 +576,368 @@ if (!empty($_POST["frm_submitlab"])) {
     if ($con->query($sql1) === TRUE) {
     }
 
-    
-    $sql="INSERT INTO `lab_report_submissions`(`Submission_Date`, `Lab_Report_ID`, `Student_id`,"
+    $sql = "INSERT INTO `lab_report_submissions`(`Submission_Date`, `Lab_Report_ID`, `Student_id`,"
         . " `Course_Group_id`, `Attachment1`, `Notes`, `Attachment2`, `Attachment3`, `Attachment4`, `Status`, `Title`,`Remarking_Reason`)"
         . " VALUES ('$date',$lab_id,$student_id,$group_id,'$targetfile','$instructions','$targetfile2','$targetfile3','$targetfile4',"
         . "'Pending','$title','')";
 
     if ($con->query($sql) === TRUE) {
-        if($_SESSION['Sub_Type']=='Individual')
-        {
+        if ($_SESSION['Sub_Type'] == 'Individual') {
             $con->query($sql = "UPDATE `lab_report_submissions` SET `Course_Group_id` = '0' WHERE `lab_report_submissions`.`Lab_Report_ID` = '$lab_id'");
         }
-    
-        $_SESSION["info_courses"] = "Thanks.  Your lab report assignment is submitted successfully.";
-        header("Location: Course.php?url=".$url); 
 
+        $_SESSION["info_courses"] = "Thanks.  Your lab report assignment is submitted successfully.";
+        header("Location: Course.php?url=" . $url);
     } else {
         echo "Error: <br>" . $con->error;
     }
 }
 
-
 // JOIN COURSE
 if (!empty($_GET["JoinCourse"])) {
-	   
+
     $id = $_GET["id"];
     $student_id = $_GET["std"];
     $joining = $_GET["joining"];
     $status = "Pending";
-            
-    if($joining == 0){ $status = "Joined";}
-            
-    $sql="INSERT INTO `course_students_table`(`Course_ID`, `Student_ID`,`Status`) VALUES ('$id','$student_id','$status')";
-    
+
+    if ($joining == 0) {
+        $status = "Joined";
+    }
+
+    $sql = "INSERT INTO `course_students_table`(`Course_ID`, `Student_ID`,`Status`) VALUES ('$id','$student_id','$status')";
+
     if ($con->query($sql) === TRUE) {
-  
-        if($joining==0)
-        {
+
+        if ($joining == 0) {
             $_SESSION["info_Courses_student"] = "You enrolled in this course successfully.";
-        }
-        else {
+        } else {
             $_SESSION["info_Courses_student"] = "Course enrollment request was sent to the lecturer.";
         }
-         
-         
-        header("Location: Courses.php"); 
-       
+
+        header("Location: Courses.php");
     } else {
         echo "Error: " . $sql . "<br>" . $con->error;
     }
-            
 }
 
-
-
-
-
 #MARK LAB REPORT
-  
+
 if (!empty($_GET["savemarks"])) {
-	   
-    $id=$_GET["id"];
-    $marks=$_GET["marks"];
-    $total=$_GET["total"];
-    $feedback=$_GET["feedback"];
-    $header=$_GET["header"];
-    $labid=$_GET["labid"];
-    $status="Marked";
-            
-    if($marks>$total)
-    {
+
+    $id = $_GET["id"];
+    $marks = $_GET["marks"];
+    $total = $_GET["total"];
+    $feedback = $_GET["feedback"];
+    $header = $_GET["header"];
+    $labid = $_GET["labid"];
+    $status = "Marked";
+
+    if ($marks > $total) {
         echo " Marks could not be greater than total";
         return;
     }
-    $date=  date("Y-m-d H:i:s");
-    $feedback="<br>@$date : ".$feedback;
-        
-    $sql="UPDATE `lab_report_submissions` SET `Marks`='$marks',`Status`='$status',"
+    $date =  date("Y-m-d H:i:s");
+    $feedback = "<br>@$date : " . $feedback;
+
+    $sql = "UPDATE `lab_report_submissions` SET `Marks`='$marks',`Status`='$status',"
         . ""
         . "Notes=if(Notes is null, ' ', concat(Notes, '$feedback'))"
         . ""
         . " WHERE Submission_ID=$id
               ";
-    
+
     if ($con->query($sql) === TRUE) {
-         
-  
-        $_SESSION["info_Marking"]="Lab Report Submission Marked";
-        header("Location: Submissions.php?id=".$labid."&header=".$header."&total=".$total); 
-  
-    
+
+        $_SESSION["info_Marking"] = "Lab Report Submission Marked";
+        header("Location: Submissions.php?id=" . $labid . "&header=" . $header . "&total=" . $total);
     } else {
         echo "Error: " . $sql . "<br>" . $con->error;
     }
-            
 }
 
-
-
-
-
 #Update Report Visibility  
 if (!empty($_GET["updatevisibility"])) {
-	   
-    $id=$_GET["id"];
-    $marks=$_GET["marks"];
-    $total=$_GET["total"];
-    $status=$_GET["status"];
-    $header=$_GET["header"];
-    $labid=$_GET["labid"];
-           
-            
-           
-    $sql="UPDATE `lab_report_submissions` SET `Visibility`='$status' WHERE Submission_ID=$id
+
+    $id = $_GET["id"];
+    $marks = $_GET["marks"];
+    $total = $_GET["total"];
+    $status = $_GET["status"];
+    $header = $_GET["header"];
+    $labid = $_GET["labid"];
+
+    $sql = "UPDATE `lab_report_submissions` SET `Visibility`='$status' WHERE Submission_ID=$id
               ";
-    
+
     if ($con->query($sql) === TRUE) {
-        
-        $_SESSION["info_Marking"]="Lab Report Visibility Updated";
-        header("Location: Submissions.php?id=".$labid."&header=".$header."&total=".$total); 
-  
-    
+
+        $_SESSION["info_Marking"] = "Lab Report Visibility Updated";
+        header("Location: Submissions.php?id=" . $labid . "&header=" . $header . "&total=" . $total);
     } else {
         echo "Error: " . $sql . "<br>" . $con->error;
     }
-            
 }
 
-
-
-
-
 #Remarking Request
-  
+
 if (!empty($_GET["remarking"])) {
-	   
-    $id=$_GET["id"];
-    $url=$_GET["url"];
-           
-    $status= $_GET["status"];
-    $details=$_GET["details"];
-           
-    $sql="UPDATE `lab_report_submissions` SET `Status`='Remarking',Remarking_Reason='$details' WHERE Submission_ID=$id
+
+    $id = $_GET["id"];
+    $url = $_GET["url"];
+
+    $status = $_GET["status"];
+    $details = $_GET["details"];
+
+    $sql = "UPDATE `lab_report_submissions` SET `Status`='Remarking',Remarking_Reason='$details' WHERE Submission_ID=$id
               ";
-    
+
     if ($con->query($sql) === TRUE) {
-         
-  
-        $_SESSION["info_ReMarking"]="Remarking Request Sent";
-        header("Location: Course.php?url=".$url); 
-  
-    
+
+        $_SESSION["info_ReMarking"] = "Remarking Request Sent";
+        header("Location: Course.php?url=" . $url);
     } else {
         echo "Error: " . $sql . "<br>" . $con->error;
     }
-            
 }
 
-
-
-
-
 #Create Group Request
-  
+
 if (!empty($_GET["creategroup"])) {
-	   
-    $student_id=$_GET["student_id"];
-    $url=$_GET["url"];
-    $id=$_GET["id"];
-    $name= $_GET["name"];
-            
-           
-    $sql="INSERT INTO `course_groups_table`(`Group_Name`, 
+
+    $student_id = $_GET["student_id"];
+    $url = $_GET["url"];
+    $id = $_GET["id"];
+    $name = $_GET["name"];
+
+    $sql = "INSERT INTO `course_groups_table`(`Group_Name`, 
                   `Group_Leader`, `Course_id`) VALUES ('$name',$student_id,$id)";
- 
-      
-            
+
     if ($con->query($sql) === TRUE) {
-         
-         
-        $resultx1 = mysqli_query($con,"Select Max(Course_Group_id) as cnt from course_groups_table");
-        while($row = mysqli_fetch_assoc($resultx1)) {$gid=$row['cnt'];} 
-         
-     
-        $sql="INSERT INTO `course_group_members_table`( `Course_Group_id`, `Student_ID`, `Status`) 
+
+        $resultx1 = mysqli_query($con, "Select Max(Course_Group_id) as cnt from course_groups_table");
+        while ($row = mysqli_fetch_assoc($resultx1)) {
+            $gid = $row['cnt'];
+        }
+
+        $sql = "INSERT INTO `course_group_members_table`( `Course_Group_id`, `Student_ID`, `Status`) 
                           VALUES ($gid,$student_id,'Created')";
         if ($con->query($sql) === TRUE) {
-            $_SESSION["info_ReMarking"]="Course group Created";
-            header("Location: Course.php?url=".$url); 
+            $_SESSION["info_ReMarking"] = "Course group Created";
+            header("Location: Course.php?url=" . $url);
         } else {
             echo "Error: " . $sql . "<br>" . $con->error;
         }
-  
-    
     } else {
         echo "Error: " . $sql . "<br>" . $con->error;
     }
-            
-}  
-
-
-
-
+}
 
 //---------------------------------------Invite Group Request and add a new member into the database------------------------------------
-  
-if (!empty($_GET["groupinvite"])) {
-	   
 
-    $student_id=$_GET["student_id"];
-    $url=$_GET["url"];
-    $courseid=$_GET["courseid"];
-    $groupid=$_GET["groupid"];
-           
-    $result = mysqli_query($con,"SELECT * FROM course_group_members_table where Course_Group_id = '$groupid' and Student_ID = '$student_id'");
-    if(mysqli_num_rows($result)>0){
-        $_SESSION["info_ReMarking"]=$student_id . " has already been invited";
-        header("Location: Course.php?url=".$url);
-    }else{
-        $sql="INSERT INTO `course_group_members_table`( `Course_Group_id`, `Student_ID`, `Status`)
+if (!empty($_GET["groupinvite"])) {
+
+    $student_id = $_GET["student_id"];
+    $url = $_GET["url"];
+    $courseid = $_GET["courseid"];
+    $groupid = $_GET["groupid"];
+
+    $result = mysqli_query($con, "SELECT * FROM course_group_members_table where Course_Group_id = '$groupid' and Student_ID = '$student_id'");
+    if (mysqli_num_rows($result) > 0) {
+        $_SESSION["info_ReMarking"] = $student_id . " has already been invited";
+        header("Location: Course.php?url=" . $url);
+    } else {
+        $sql = "INSERT INTO `course_group_members_table`( `Course_Group_id`, `Student_ID`, `Status`)
                       VALUES ($groupid,$student_id,'Invited')";
     }
-	   
-	   
+
     if ($con->query($sql) === TRUE) {
-        $resultx1 = mysqli_query($con,"SELECT * FROM course_groups_table where Course_Group_id ='$groupid'");
-	      
-        while($row = mysqli_fetch_assoc($resultx1)) 
-            {
-                $Group_Member=$row['Group_Member']; 
-                $Group_Member4=$row['Group_Member4'];
-                $Group_Member2=$row['Group_Member2'];
-                $Group_Member3=$row['Group_Member3'];
-                $_SESSION['Group_Member4']=$Group_Member4;
-                $_SESSION['Group_Member3']=$Group_Member3;
-                $_SESSION['Group_Member2']=$Group_Member2;
-                $_SESSION['Group_Member']=$Group_Member;
-	   
-                if($Group_Member=='0'){ 
-                    mysqli_query($con,"UPDATE `course_groups_table` SET `Group_Member` = ('" . $student_id . "') WHERE `course_groups_table`.`Course_Group_id` = '$groupid'");
-                    $_SESSION["info_ReMarking"]=$student_id . " was invited to the group";
-                    header("Location: Course.php?url=".$url);
-                }elseif($Group_Member2=='0'){
-                    mysqli_query($con,"UPDATE `course_groups_table` SET `Group_Member2` = ('" . $student_id . "') WHERE `course_groups_table`.`Course_Group_id` = '$groupid'");
-                    $_SESSION["info_ReMarking"]=$student_id . " was invited to the group";
-                    header("Location: Course.php?url=".$url);
-                }elseif($Group_Member3=='0'){
-                    mysqli_query($con,"UPDATE `course_groups_table` SET `Group_Member3` = ('" . $student_id . "') WHERE `course_groups_table`.`Course_Group_id` = '$groupid'");
-                    $_SESSION["info_ReMarking"]=$student_id . " was invited to the group";
-                    header("Location: Course.php?url=".$url);
-                }elseif($Group_Member4=='0'){
-                    mysqli_query($con,"UPDATE `course_groups_table` SET `Group_Member4` = ('" . $student_id . "') WHERE `course_groups_table`.`Course_Group_id` = '$groupid'");
-                    $_SESSION["info_ReMarking"]=$student_id . " was invited to the group";
-                    header("Location: Course.php?url=".$url);
-                } else {
-                    $_SESSION["info_ReMarking"]= " You cant add any more members";
-                    header("Location: Course.php?url=".$url);
-	        
-                }
+        $resultx1 = mysqli_query($con, "SELECT * FROM course_groups_table where Course_Group_id ='$groupid'");
+
+        while ($row = mysqli_fetch_assoc($resultx1)) {
+            $Group_Member = $row['Group_Member'];
+            $Group_Member4 = $row['Group_Member4'];
+            $Group_Member2 = $row['Group_Member2'];
+            $Group_Member3 = $row['Group_Member3'];
+            $_SESSION['Group_Member4'] = $Group_Member4;
+            $_SESSION['Group_Member3'] = $Group_Member3;
+            $_SESSION['Group_Member2'] = $Group_Member2;
+            $_SESSION['Group_Member'] = $Group_Member;
+
+            if ($Group_Member == '0') {
+                mysqli_query($con, "UPDATE `course_groups_table` SET `Group_Member` = ('" . $student_id . "') WHERE `course_groups_table`.`Course_Group_id` = '$groupid'");
+                $_SESSION["info_ReMarking"] = $student_id . " was invited to the group";
+                header("Location: Course.php?url=" . $url);
+            } elseif ($Group_Member2 == '0') {
+                mysqli_query($con, "UPDATE `course_groups_table` SET `Group_Member2` = ('" . $student_id . "') WHERE `course_groups_table`.`Course_Group_id` = '$groupid'");
+                $_SESSION["info_ReMarking"] = $student_id . " was invited to the group";
+                header("Location: Course.php?url=" . $url);
+            } elseif ($Group_Member3 == '0') {
+                mysqli_query($con, "UPDATE `course_groups_table` SET `Group_Member3` = ('" . $student_id . "') WHERE `course_groups_table`.`Course_Group_id` = '$groupid'");
+                $_SESSION["info_ReMarking"] = $student_id . " was invited to the group";
+                header("Location: Course.php?url=" . $url);
+            } elseif ($Group_Member4 == '0') {
+                mysqli_query($con, "UPDATE `course_groups_table` SET `Group_Member4` = ('" . $student_id . "') WHERE `course_groups_table`.`Course_Group_id` = '$groupid'");
+                $_SESSION["info_ReMarking"] = $student_id . " was invited to the group";
+                header("Location: Course.php?url=" . $url);
+            } else {
+                $_SESSION["info_ReMarking"] = " You cant add any more members";
+                header("Location: Course.php?url=" . $url);
             }
-        $_SESSION["info_ReMarking"]=$student_id . " was invited to the group";
-        header("Location: Course.php?url=".$url); 
+        }
+        $_SESSION["info_ReMarking"] = $student_id . " was invited to the group";
+        header("Location: Course.php?url=" . $url);
     } else {
         echo "Error: " . $sql . "<br>" . $con->error;
     }
 }
 
-
 #Accept deny Group Invite
-  
+
 if (!empty($_GET["acceptinvite"])) {
-	   
-    $student_id=$_GET["student_id"];
-    $url=$_GET["url"];
-    $action=$_GET["action"];
-    $groupid=$_GET["groupid"];
-            
-    if($action==1)
-    {
-        $sql="Update  `course_group_members_table` set Status='Joined' where  Course_Group_id =$groupid and student_id=$student_id 
-                         ";  
+
+    $student_id = $_GET["student_id"];
+    $url = $_GET["url"];
+    $action = $_GET["action"];
+    $groupid = $_GET["groupid"];
+
+    if ($action == 1) {
+        $sql = "Update  `course_group_members_table` set Status='Joined' where  Course_Group_id =$groupid and student_id=$student_id 
+                         ";
+    } else {
+        $sql = "Delete from  `course_group_members_table`  where  Course_Group_id =$groupid and student_id=$student_id 
+                         ";
     }
-    else
-    {
-        $sql="Delete from  `course_group_members_table`  where  Course_Group_id =$groupid and student_id=$student_id 
-                         "; 
-    }
-          
+
     if ($con->query($sql) === TRUE) {
-        $_SESSION["info_ReMarking"]=" Group Invite Updated";
-        header("Location: Course.php?url=".$url); 
+        $_SESSION["info_ReMarking"] = " Group Invite Updated";
+        header("Location: Course.php?url=" . $url);
     } else {
         echo "Error: " . $sql . "<br>" . $con->error;
     }
-  
 }
 
-
-
-
-
 #Extend Deadline
-  
+
 if (!empty($_GET["extenddeadline"])) {
-	   
-    $id=$_GET["id"];
-    $date=$_GET["date"];
-    $time=$_GET["time"];
-    $type=$_GET["type"];
-             
-    $stdid=$_GET["stdid"];
-    $reason =$_GET["reason"];
-    $url =$_GET["url"];
-    $deadline=$date." ".$time;
-             
-            
-    if($type==1)
-    {
-        $sql="UPDATE `lab_reports_table` SET  `Deadline`='$deadline'  WHERE Lab_Report_ID=$id"; 
-                          
-    }
-    else
-    {
-        $sql="INSERT INTO `extended_deadlines_table`(`Student_ID`, "
+
+    $id = $_GET["id"];
+    $date = $_GET["date"];
+    $time = $_GET["time"];
+    $type = $_GET["type"];
+
+    $stdid = $_GET["stdid"];
+    $reason = $_GET["reason"];
+    $url = $_GET["url"];
+    $deadline = $date . " " . $time;
+
+    if ($type == 1) {
+        $sql = "UPDATE `lab_reports_table` SET  `Deadline`='$deadline'  WHERE Lab_Report_ID=$id";
+    } else {
+        $sql = "INSERT INTO `extended_deadlines_table`(`Student_ID`, "
             . "`Lab_Report_ID`, `Extended_Deadline_Date`,"
             . " `ReasonsForExtension`) VALUES ($stdid,$id,'$deadline','$reason')";
-                  
     }
-                
-          
+
     if ($con->query($sql) === TRUE) {
-        
-          
-        $_SESSION["info_courses"]=" Lab Report Deadline extended successfully.";
-        header("Location: Courses.php?course=".$url);
-          
+
+        $_SESSION["info_courses"] = " Lab Report Deadline extended successfully.";
+        header("Location: Courses.php?course=" . $url);
     } else {
         echo "Error: " . $sql . "<br>" . $con->error;
     }
-  
 }
 
-
-
-
-
 #IGNORE Remarking Request
-  
-if (!empty($_GET["ignoreremarking"])) {
-	   
-	
-    $id=$_GET["id"];
-    $total=$_GET["total"];
-    $header=$_GET["header"];
-           
-    $subid=$_GET["subid"];
-            
-           
-    $sql="UPDATE lab_report_submissions SET Status='Marked' WHERE Submission_ID=$subid";
-    
-             
-              
-    if ($con->query($sql) === TRUE) {
-         
-  
-        
-        $_SESSION["info_Marking"]="Remarking Request Ignored , Submission Updated to 'Marked' status";
-        header("Location: Submissions.php?id=".$id."&header=".$header."&total=".$total); 
 
-    
+if (!empty($_GET["ignoreremarking"])) {
+
+    $id = $_GET["id"];
+    $total = $_GET["total"];
+    $header = $_GET["header"];
+
+    $subid = $_GET["subid"];
+
+    $sql = "UPDATE lab_report_submissions SET Status='Marked' WHERE Submission_ID=$subid";
+
+    if ($con->query($sql) === TRUE) {
+
+        $_SESSION["info_Marking"] = "Remarking Request Ignored , Submission Updated to 'Marked' status";
+        header("Location: Submissions.php?id=" . $id . "&header=" . $header . "&total=" . $total);
     } else {
         echo "Error: " . $sql . "<br>" . $con->error;
     }
-            
 }
 
-
-
-
-
 #Assign TA
-  
-if (!empty($_GET["assignTA"])) {
-	   
-	
-    $id=$_GET["id"];
-    $ta=$_GET["ta"];
-            
-           
-    $sql="INSERT INTO `course_ta`(`Course_ID`, `TA`) VALUES ($id,$ta)";
-    
-             
-              
-    if ($con->query($sql) === TRUE) {
-         
-  
-        $_SESSION["info_Admin_Courses"]=$type." Course TA Assigned ";
-        header("Location: Admin.php");
-                                 
-        
 
-    
+if (!empty($_GET["assignTA"])) {
+
+    $id = $_GET["id"];
+    $ta = $_GET["ta"];
+
+    $sql = "INSERT INTO `course_ta`(`Course_ID`, `TA`) VALUES ($id,$ta)";
+
+    if ($con->query($sql) === TRUE) {
+
+        $_SESSION["info_Admin_Courses"] = $type . " Course TA Assigned ";
+        header("Location: Admin.php");
     } else {
         echo "Error: " . $sql . "<br>" . $con->error;
     }
-            
 }
 
-
-
-
-
 //ACCEPT STUDNTS JOINING COURSSS
- 
+
 if (!empty($_GET["AcceptStudent"])) {
-	   
-    $id=$_GET["id"];
-    $rs=$_GET["rs"];
-         
-    if($rs=="yes")
-    {
-        $sql="Update  course_students_table set Status='Joined' Where ID=$id";
-    
-                
+
+    $id = $_GET["id"];
+    $rs = $_GET["rs"];
+
+    if ($rs == "yes") {
+        $sql = "Update  course_students_table set Status='Joined' Where ID=$id";
     } else {
-        $sql="Delete FROM  course_students_table Where ID=$id";
+        $sql = "Delete FROM  course_students_table Where ID=$id";
     }
-           
+
     if ($con->query($sql) === TRUE) {
-         
-  
-        if($rs=="yes")
-        {
-            $_SESSION["info_courses"]="Course Joining request Approved.";
+
+        if ($rs == "yes") {
+            $_SESSION["info_courses"] = "Course Joining request Approved.";
+        } else {
+            $_SESSION["info_courses"] = "Course Joining request Declined & Removed.";
         }
-        else {
-            $_SESSION["info_courses"]="Course Joining request Declined & Removed.";
-        }
-   
-        header("Location: Courses.php"); 
-   
-    }
-    else {
+
+        header("Location: Courses.php");
+    } else {
         echo "Error: " . $sql . "<br>" . $con->error;
     }
-
 }
 
-
-
-
-
 //action=passchange&uid=1&pass=1929
- 
-if (!empty($_GET["action"])) {
-	   
-    $action=$_GET["action"];
-    $uid=$_GET["uid"];
 
-    
+if (!empty($_GET["action"])) {
+
+    $action = $_GET["action"];
+    $uid = $_GET["uid"];
+
     $pass = $_GET["pass"];
     $pass = password_hash($pass, PASSWORD_DEFAULT);
 
-
-    $status=$_GET["status"];
-
+    $status = $_GET["status"];
 
     // validate uid
     if (intval($uid) < 0) {
         header("Location: index.php");
-        return;       
+        return;
     }
 
-		 
-    if($action=="passchange")
-    {
-        $sql= "UPDATE users_table set Password='$pass' where User_ID=$uid;";
+    if ($action == "passchange") {
+        $sql = "UPDATE users_table set Password='$pass' where User_ID=$uid;";
         if ($con->query($sql) === TRUE) {
             error_reporting(0);
             echo "Password has been changed";
             // return;
-            $_SESSION["infoChangePassword"]=$type." User password was changed successfully.";
+            $_SESSION["infoChangePassword"] = $type . " User password was changed successfully.";
             header("Location: index.php");
         } else {
             // echo "Error: " . $sql . "<br>" . $con->error;
@@ -1144,47 +945,38 @@ if (!empty($_GET["action"])) {
         }
     }
 
-
-    if($action=="statuschange")
-    {
-        $sql= "UPDATE users_table set Status='$status' where User_ID=$uid;";
+    if ($action == "statuschange") {
+        $sql = "UPDATE users_table set Status='$status' where User_ID=$uid;";
         if ($con->query($sql) === TRUE) {
-            $_SESSION["info_Admin_Users"]=$type." user  Status updated successfully ";
+            $_SESSION["info_Admin_Users"] = $type . " user  Status updated successfully ";
             header("Location: Admin.php");
         } else {
             // echo "Error: " . $sql . "<br>" . $con->error;
-            echo "Something really bad happened while changing status.  Contact lanhui at zjnu.edu.cn.  Thanks!";	  
-        }  	   
+            echo "Something really bad happened while changing status.  Contact lanhui at zjnu.edu.cn.  Thanks!";
+        }
     }
 }
 
-
-
-
-
 // ############################### CREATE STUDENT USER ##################################
 if (!empty($_POST["frm_createCourse"])) {
-    $name=mysqli_real_escape_string($con,$_POST["name"]);
-    $academic=mysqli_real_escape_string($con,$_POST["academic"]);
-    $lecturer=mysqli_real_escape_string($con,$_POST["lecturer"]);
-    $ta=mysqli_real_escape_string($con,$_POST["ta"]);
-    $faculty=mysqli_real_escape_string($con,$_POST["faculty"]);
-    $code=mysqli_real_escape_string($con,$_POST["code"]);
-    $url=mysqli_real_escape_string($con,$_POST["url"]);  
-    $verify=mysqli_real_escape_string($con,$_POST["verify"]);
-    $who=mysqli_real_escape_string($con,$_POST["l"]);
-                  
-    if($url=="")
-    {
-        $url= $code.$academic;
+    $name = mysqli_real_escape_string($con, $_POST["name"]);
+    $academic = mysqli_real_escape_string($con, $_POST["academic"]);
+    $lecturer = mysqli_real_escape_string($con, $_POST["lecturer"]);
+    $ta = mysqli_real_escape_string($con, $_POST["ta"]);
+    $faculty = mysqli_real_escape_string($con, $_POST["faculty"]);
+    $code = mysqli_real_escape_string($con, $_POST["code"]);
+    $url = mysqli_real_escape_string($con, $_POST["url"]);
+    $verify = mysqli_real_escape_string($con, $_POST["verify"]);
+    $who = mysqli_real_escape_string($con, $_POST["l"]);
+
+    if ($url == "") {
+        $url = $code . $academic;
     }
-                       
-                     
-    if($ta=="")
-    {
-        $ta=0;
+
+    if ($ta == "") {
+        $ta = 0;
     }
-          
+
     // check if email is taked
     //     $result = mysqli_query($con,
     //        "SELECT * FROM courses_table WHERE Course_Name='$name'");
@@ -1194,42 +986,31 @@ if (!empty($_POST["frm_createCourse"])) {
     //        header("Location: Admin.php");        
     //    }
     //    
-  
-    $sql="INSERT INTO `courses_table`(`Course_Name`, `Academic_Year`, `Faculty`, `Lecturer_User_ID`, `TA_User_ID`, `Course_Code`, `URL`, `Verify_New_Members`) 
+
+    $sql = "INSERT INTO `courses_table`(`Course_Name`, `Academic_Year`, `Faculty`, `Lecturer_User_ID`, `TA_User_ID`, `Course_Code`, `URL`, `Verify_New_Members`) 
             VALUES ('$name','$academic','$faculty','$lecturer','$ta','$code','$url','$verify')";
-    
-    
+
     if ($con->query($sql) === TRUE) {
-        $_SESSION["info_Admin_Courses"]="Course portal was Created successfully.";
-        if($who=="l")
-        {
-            header("Location: Courses.php");    
-        } else
-        {
-            header("Location: Admin.php"); 
+        $_SESSION["info_Admin_Courses"] = "Course portal was Created successfully.";
+        if ($who == "l") {
+            header("Location: Courses.php");
+        } else {
+            header("Location: Admin.php");
         }
-         
-    
     } else {
         echo "Error: " . $sql . "<br>" . $con->error;
     }
 }
 
-
-
-
-
 // Export grade
- 
+
 if (!empty($_GET["exportgrade"])) {
-	   
-    $lab=$_GET["lab"];
-    $lab_name=$_GET["lab_name"];
-    
-       
-       
+
+    $lab = $_GET["lab"];
+    $lab_name = $_GET["lab_name"];
+
     error_reporting(0);
-       
+
     $select = "SELECT lab_reports_table.Title as 'LAB_Report', lab_reports_table.Marks as Lab_Marks,
  `Submission_Date`, lab_report_submissions.Student_id, users_table.Full_Name as Student_Name,  lab_report_submissions.Marks,`Notes`
 FROM `lab_report_submissions`
@@ -1238,46 +1019,33 @@ INNER JOIN lab_reports_table on lab_reports_table.Lab_Report_ID=lab_report_submi
 
 INNER JOIN users_table on users_table.Student_ID=lab_report_submissions.Student_id
 
-
 WHERE lab_report_submissions.Lab_Report_ID=$lab";
 
+    $export  = mysqli_query($con, $select);
 
-    $export  = mysqli_query($con,$select);
-       
-       
-       
-    $fields = mysqli_num_fields ( $export );
+    $fields = mysqli_num_fields($export);
 
-     
-    for ( $i = 0; $i < $fields; $i++ )
-    {
-        $header .= mysqli_fetch_field_direct( $export , $i )->name. "\t";
+    for ($i = 0; $i < $fields; $i++) {
+        $header .= mysqli_fetch_field_direct($export, $i)->name . "\t";
     }
 
-
-    while( $row = mysqli_fetch_row( $export ) )
-    {
+    while ($row = mysqli_fetch_row($export)) {
         $line = '';
-        foreach( $row as $value )
-        {                                            
-            if ( ( !isset( $value ) ) || ( $value == "" ) )
-            {
+        foreach ($row as $value) {
+            if ((!isset($value)) || ($value == "")) {
                 $value = "\t";
-            }
-            else
-            {
-                $value = str_replace( '"' , '""' , $value );
+            } else {
+                $value = str_replace('"', '""', $value);
                 $value = '"' . $value . '"' . "\t";
             }
             $line .= $value;
         }
-        $data .= trim( $line ) . "\n";
+        $data .= trim($line) . "\n";
     }
-    $data = str_replace( "\r" , "" , $data );
+    $data = str_replace("\r", "", $data);
 
-    if ( $data == "" )
-    {
-        $data = "\n(0) Records Found!\n";                        
+    if ($data == "") {
+        $data = "\n(0) Records Found!\n";
     }
 
     header("Content-type: application/octet-stream");
@@ -1285,5 +1053,4 @@ WHERE lab_report_submissions.Lab_Report_ID=$lab";
     header("Pragma: no-cache");
     header("Expires: 0");
     print "$header\n$data";
-           
 }