<?php
$raw_str = 'hello world';
echo '加密前'.$raw_str.'<br>';
$salt = substr(str_shuffle('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'), 0, 22);
$enc_str = crypt($raw_str,$salt);
echo '加密后'.$enc_str.'<br>';