Simple mcrypt encrypt & decrypt functions for PHP

simple_encrypt.php

<?php

    $salt ='whatever_you_want'

    function simple_encrypt($text)
    {  
        return trim(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $salt, $text, MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND))));
    }

    function simple_decrypt($text)
    {  
        return trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $salt, base64_decode($text), MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND)));
    }

?>

Sorry, i know, this gist is 6 years old, but i use this way too, is there a solution to migrate from mcrypt to openssl? mcrypt will be removed in php-7.2, so now i get with php-7.1 the deprecated messages. What i understand is, openssl does not support RIJNDAEL_256? So j have to reencrypt all files?

Same problem :(