PHP MySQLi Photo single page

Question

I have made a photo gallery, which shows photos from MySQLi database, but when I click on the link on each photo, it must go to a single page that only shows that photo.

Index.php

$query = mysqli_query($conn, "SELECT * FROM images");
 while($row = mysqli_fetch_array($query)) {
   $id = $row['id'];     
   $image = $row['image'];
   echo "<td><a href='single.php?id=$id'><img src='$image'></a></td>";
}

Single.php

$id = $row['id'];
$query = mysqli_query($conn, "SELECT * FROM images WHERE id='$id'");
<?php
while($row = mysqli_fetch_array($query)) {
  $image = $row['image'];
  echo "<img src='$image'>";
}

Answer 1

Single.php将第一行更改为

$id = intval($_GET['id']);