mcrypt_encrypt＆mcrypt_decrypt在localhost上不起作用

I use mcrypt_decrypt and encrypt to my live website. Now, I would like to change some codes on it and test it on localhost. The encrypting/decrypting works well on my live web, but not on localhost. I echo each encryted variable to see if there are value but it seems no work at all. Any idea?

$secret_key ="qazxsw";
$email="myemail1@email.com"; 

$encrypted_data = trim(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $secret_key, $email, MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND))));


echo $encrypted_data ;

EDIT: XAMPP-5.6.3

You have take this error beacuse this Algorythm you used is not suppor 8 char keys,

please increase your $secretkey="" to 16 char below codes

<?PHP
$secret_key ="qazxswqazxswqazx";
$email="myemail1@email.com"; 

$encrypted_data = trim(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $secret_key, $email, MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND))));


echo $encrypted_data ;
?>

OutPut :

F2GUGzXHKXZruXDpAwMWBeSzwcRKS+CYl/ekUt+dHto=

function encryptIt( $value ) {
        $cryptKey  = 'qJB0rGtIn5U453G03efyCp';

        $qEncoded  = base64_encode( mcrypt_encrypt( MCRYPT_RIJNDAEL_256, md5( $cryptKey ), $value, MCRYPT_MODE_CBC, md5( md5( $cryptKey ) ) ) );
        return( $qEncoded );
    }