function hex2bin($data) {
     $len = strlen($data);
     return pack("H" . $len, $data); 
} 

function check_key($input){
    $iv = "qe3jigneqfrgnqw2egfmas4qetjkn5lg";
    $key = "589752d5b0f4217747bd721111be9057"; 
    $text = hex2bin($input);
    $domain = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv);
    echo $input. '<br/>' .$domain;
}