<?php $id_book = $_POST['id_book']; ?>
<?php

   
  $filePath = $_POST['delete_file'];  //delete_file
if (file_exists($filePath)) 
               {
                 unlink($filePath);
                  echo "File Successfully Delete."; 
              }
              else
              {
               echo "File does not exists"; 
              }
    
	ini_set('display_errors', 1);
	error_reporting(~0);

?>

<script type='text/javascript'>
            window.location.href = "http://www.kidsbangna.ru.ac.th/delete/?id=<?php echo $id_book; ?>";
</script>