What code?

Question

<?php
ini_set('display_errors', '1');

function getvideo($url)
{
$plain_txt = base64_encode($url.'@'.$_SERVER['HTTP_HOST']);
$string = $plain_txt;
$encrypt_method = "AES-256-CBC";
$secret_key = 'This is my secret key';
$secret_iv = 'This is my secret iv';
// hash
$key = hash('sha256', $secret_key);
// iv - encrypt method AES-256-CBC expects 16 bytes - else you will get a warning
$iv = substr(hash('sha256', $secret_iv), 0, 16);
$output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);
$output = base64_encode($output);
$encrypted_txt = $output;
$urlen = $encrypted_txt;
return '<iframe class=\'embed-responsive-item\' style="border:0px #FFFFFF none;" scrolling="no" frameborder="0" marginheight="0px" marginwidth="0px" height="360px" width="640px" src="//sibeol.com/e/wp-embed.php?url='.$urlen.'" allowfullscreen></iframe>';
}
?>