A crypt() wrapper that takes named arguments.

smart_crypt.php

<?php
function smart_crypt($str, $salt, $algo=CRYPT_STD_DES, $rounds=5000, $cost=7) {
    switch ($algo) {
        case CRYPT_EXT_DES:
            $salt = substr($salt, 0, 4);
            return crypt($str, '_?..' . $salt);
            
        case CRYPT_MD5:
            $salt = substr($salt, 0, 12);
            return crypt($str, '$1$' . $salt . '$');
            
        case CRYPT_BLOWFISH:
            if ($cost < 10) { $cost = '0' . $cost; }
            if ($cost > 99) { $cost = substr($cost, 0, 2); };
            $salt = substr($salt, 0, 22);
            return crypt($str, '$2a$' . $cost . '$' . $salt . '$');
            
        case CRYPT_SHA256:
            $salt = substr($salt, 0, 16);
            return crypt($str, '$5$rounds=' . $rounds . '$' . $salt . '$');
            
        case CRYPT_SHA512:
            $salt = substr($salt, 0, 16);
            return crypt($str, '$6$rounds=' . $rounds . '$' . $salt . '$');
            
        case CRYPT_STD_DES:
        default:
            $salt = substr($salt, 0, 2);
            return crypt($str, $salt);
    }
}
?>