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please help me check what probelm code

generate.php

<?php

header("Content-type: image/jpeg");

mysqli_connect('localhost','root','','');

 mysqli_select_db('a_database');

 

 

if (isset($_GET['id'])){

  $id = $_GET['id'];

  

  $query = mysqli_query( "SELECT `email` FROM `users` WHERE `id`= '".mysqli_real_escape_string($id )."' ");

 if(mysqli_num_rows($query)>=1) {

     $email = mysql_result($query,0,'email');

 

 }else {

$email = 'ID not found';

 }   

  

}else{

$email = 'No ID specified';

  

 

 

 $email_length = strlen($email);

 

 $font_size = 4;

 

 $image_height = ImageFontHeight($font_size );

 $image_width =  ImageFontWidth($font_size ) * $email_length;

 

 $image = imagecreate ( 1521, 800 );//($image_height,$image_height);

 

 imagecolorallocate($image,255,255,255);

 $font_color = imagecolorallocate($image,0,0,0);

 

 imagestring($image,$font_size,0,0,$email,$font_color);

 imagejpeg($image);

 

?>

index.php

Name:<br>

Alex

<br><br>

Email : <br>

<img src = "generate.php?id=1"/>

 

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