PHP 12个常用功能的函数

demo1.php

<?php
header('Content-Type: text/html; charset=utf-8');
//PHP加密解密
function encryptDecrypt($key, $string, $decrypt){
    if($decrypt){
        $decrypted = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($key), base64_decode($string), MCRYPT_MODE_CBC, md5(md5($key))), "12");
        return $decrypted;
    }else{
        $encrypted = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $string, MCRYPT_MODE_CBC, md5(md5($key))));
        return $encrypted;
    }
}
//加密：
echo encryptDecrypt('demo', '网址：onestopweb.iteye.com',0),'<br>';
//解密：
echo encryptDecrypt('demo', 'lONfy9/i2RmCh31P/cKFfM6Jd90ijfg0rhJr1GihF+o=',1);

/* 输出效果：
 * lONfy9/i2RmCh31P/cKFfM6Jd90ijfg0rhJr1GihF+o=
 * 网址：onestopweb.iteye.com
 * */<?php
header('Content-Type: text/htm