Mcrypt function has been deprecated as of PHP 7.1.0.
My deprecated string encode / decode functions:
$key: secret key
$str: string
$encoded = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $str, MCRYPT_MODE_CBC, md5(md5($key))));
$decoded = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($key), base64_decode($str), MCRYPT_MODE_CBC, md5(md5($key))), "\0");
Can you suggest some alternatives?
You should use openssl_encrypt instead.