Crypter et décrypter une chaine str avec openssl_encrypt() et _decrypt

// ENCRYPT
function judevEncrypt($str){
    $password       = "OPEN#SSL/è!7";
    $str_encrypted  = openssl_encrypt ($str, "AES-128-ECB", $password);
    return $str_encrypted;
}

// DECRYPT
function judevDecrypt($str){
    $password       = "OPEN#SSL/è!7";
    $str_decrypted  = openssl_decrypt ($str, "AES-128-ECB", $password);
    return $str_decrypted;
}

// MAIN
$msg            = "I love you <3";
$msg_encrypted  = judevEncrypt($msg);
$msg_decrypted  = judevDecrypt($msg_encrypted);

echo( $msg_encrypted ); // "tP/g3HN76Ch1b0bUehQVjQ=="
echo( $msg_decrypted ); // "I love you <3"