DELETE ROW where ID = $id not deleting the row requested - php

Question

I'm trying to implement a feature which allows me to delete students from a students list. (which is a table)
Though when I click delete it does not delete the student in that current row HOWEVER.. if i change my query to DELETE FROM students WHERE id = 1 for example.. it works. So, I'm believing the problem lies with not being able to grab the id from the current row however, I'm not sure where I am going wrong with this.
//StudentsList.php
<?php include ('../resources/styling.html'); ?>
<?php include ('adminNavbar.php'); ?>
<!--HTML styling of the table that outputs the database entries, bootstrap styling-->
<div class="container content-area">
<div class="row">
<div class="col-md-12">
<div class="panel">
<br>
<div class="text-center border border-light p-5">
<p class="h4 mb-4">All Student Accounts</p>
</div>
<br>
<table class="table table-hover">
<thead>
<tr>
<th scope="col">#</th>
<th scope="col">First Name</th>
<th scope="col">Surname</th>
<th scope="col">Programme</th>
<th scope="col">Student ID</th>
<th scope="col">Delete</th>
</tr>
</thead>
<tbody>
</div>
</div>
</div>
</div>
<?php
include ('../resources/config.php');
$sql = "SELECT id,firstname, surname, programme, studentid FROM students";
$result = $db->query($sql);
// while loop to output data of each row for each student in database
while($row = $result->fetch_assoc()) {
echo '<tr>
<td scope="row">' . $row["id"]. '</td>
<td>' . $row["firstname"] .'</td>
<td> '.$row["surname"] .'</td>
<td> '.$row["programme"] .'</td>
<td> '.$row["studentid"] .'</td>
<td ><a class="btn btn-danger" href="MLdelete.php?id=".$row["id"].""</a> Delete</td>
</tr>';
}
$db->close();
?>
</tbody>
</table>
<div class="text-center border border-light p-5">
Add New Student Account
</div>
//MLdelete.php
<?php
require ( '../resources/config.php' );
if(isset($_GET["id"])){
$id = mysqli_real_escape_string($db, $_GET["id"]);
// sql to delete a record
$query = "DELETE FROM students WHERE id ='{$id}'";
$del=mysqli_query($db,$query);
if ($del) {
header("Location: StudentsList.php");
} else {
echo "Error deleting record: " . $db->error;
}
}
$db->close();
?>
Basically, when I click the DELETE button for a row, nothing happens.

Answer 1

You did not properly quote your <a> link.
It should be
<td ><a class="btn btn-danger" href="MLdelete.php?id=' . $row["id"] . '"</a> Delete</td>
Also use prepared statements as per my comment. This will prevent SQL injection attacks.
Check out prepared statements explanation and examples via the PHP manual