View difference between Paste ID: xL3vcdML and xbZPvxsT

 <?php
 
 if(isset($_POST['save'])){
-	$checkbox = $_POST['check'];
+	$checkbox = NULL;
-	for($i=0;$i<count($checkbox);$i++){
+
-	$del_id = $checkbox[$i];
+	if (isset($_POST['check']))
-    mysqli_query($link,"DELETE FROM admin WHERE id='".$del_id."'");
+	{
-
+		$checkbox = $_POST['check'];
-	$message = "Data deleted successfully !";
+	}
 
 	if (is_array($checkbox))
 	{
 		$checkboxCount = count($checkbox);
 
 		for($i=0; $i < $checkboxCount; $i++)
 		{
 			/* 	IMPORTANT:
 				You need to validate each $checkbox item to make sure:
 				- it is a valid int number
 				- the current user has permission to delete it
 			*/
 
 			$del_id = $checkbox[$i];
 
 			/* Make sure $del_id is a valid int. You should also check that is a correct database ID. */
 			if (filter_var($del_id, FILTER_VALIDATE_INT))
 			{
     			mysqli_query($link,"DELETE FROM admin WHERE id='".mysqli_real_escape_string($link, $del_id)."'");
 			}
    		}
 
 		$message = "Data deleted successfully !";
 	}
 	else
 	{
 		$message = "No data selected!";
 	}
 }
 
 $result = mysqli_query($link,"SELECT * FROM admin LIMIT $offset,$total_records_per_page");
 ?>
 <!DOCTYPE html>
 <html>
 <head>
 <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
 <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
 
 
 <style><?php include 'Backend.css'; ?></style>
 
     <meta charset="UTF-8">
     <title>Dashboard</title>
     <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.css">
     <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
     <script src='https://kit.fontawesome.com/a076d05399.js'></script>
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
 
 </head>
 <body>
 
 
 
 <div><?php if(isset($message)) { echo $message; } ?>
 </div>
 <div class="container">
 
 <form method="post" action="admin.php">
 <table class="table table-bordered" id="myTables">
 <thead>
 <tr>
     <th><input type="checkbox" id="checkAl"> Select All</th>
 	<th>Admin Id</th>
 	<th>Username</th>
 	<th>Email</th>
 	<th>Password</th>
 	<th>Action</th>
 </tr>
 </thead>
 <?php
 $i=0;
 while($row = mysqli_fetch_array($result)) {
 ?>
 <tr>
     <td><input type="checkbox" id="checkItem" name="check[]" value="<?php echo $row["id"]; ?>"></td>
     <td><?php echo $row["id"]; ?></td>
 
 	<td><?php echo $row["username"]; ?></td>
 	<td><?php echo $row["email"]; ?></td>
 	<td><?php echo $row["password"]; ?></td>
 <?Php
                                             echo "<td>";
 
     echo "<a href='Admin-View.php?id=". $row['id'] ."' title='View Record' data-toggle='tooltip'><span class='glyphicon glyphicon-eye-open'></span></a>";
                                             echo "<a href='Admin-Update.php?id=". $row['id'] ."' title='Update Record' data-toggle='tooltip'><span class='glyphicon glyphicon-pencil'></span></a>";
                                             echo "<a href='Admin-Delete.php?id=". $row['id'] ."' title='Delete Record' data-toggle='tooltip'><span class='glyphicon glyphicon-trash'></span></a>";
 
                                           echo "</td>";
                                           ?>
 
 
 </tr>
 </div>
             </div>
         </div>
     </div>
     </div>
 
 <?php
 $i++;
 }
 ?>
 </table>
  <input type="submit" name="submit" value="Delete" class="btn btn-primary btn-md pull-left" onClick="return confirm('Are you sure you want to delete?');" ></td>
 </form>
 
 
 <script>
 $("#checkAl").click(function () {
 $('input:checkbox').not(this).prop('checked', this.checked);
 });
 
 
 </script>
 </body>
 </html>