本文实例讲述了PHP实现的加密解密处理类。分享给大家供大家参考，具体如下：
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<?php
/*===========================================================
= 版权协议：
= GPL (The GNU GENERAL PUBLIC LICENSE Version 2, June 1991)
=------------------------------------------------------------
= 文件名称：cls.sys_crypt.php
= 摘 要：php加密解密处理类
= 版 本：1.0
= 参 考：Discuz论坛的passport相关函数
=------------------------------------------------------------
= 最后更新日期：2007-12-09
============================================================*/
class SysCrypt {
private $crypt_key;
// 构造函数
public function __construct($crypt_key) {
$this -> crypt_key = $crypt_key;
}
public function php_encrypt($txt) {
srand((double)microtime() * 1000000);
$encrypt_key = md5(rand(0,32000));
$ctr = 0;
$tmp = '';
for($i = 0;$i<strlen($txt);$i++) {
$ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
$tmp .= $encrypt_key[$ctr].($txt[$i]^$encrypt_key[$ctr++]);
}
return base64_encode(self::__key($tmp,$this -> crypt_key));
}
public function php_decrypt($txt) {
$txt = self::__key(base64_decode($txt),$this -> crypt_key);
$tmp = '';
for($i = 0;$i < strlen($txt); $i++) {
$md5 = $txt[$i];
$tmp .= $txt[++$i] ^ $md5;
}
return $tmp;
}
private function __key($txt,$encrypt_key) {
$encrypt_key = md5($encrypt_key);
$ctr = 0;
$tmp = '';
for($i = 0; $i < strlen($txt); $i++) {
$ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
$tmp .= $txt[$i] ^ $encrypt_key[$ctr++];
}
return $tmp;
}
public function __destruct() {
$this -> crypt_key = null;
}
}
//执行代码
$sc = new SysCrypt('phpwms');
$text = 'abc10000008910000000990099hh'; //需要加密的数据
print($sc -> php_encrypt($text)); //加密
print('<br>');
print($sc -> php_decrypt($sc -> php_encrypt($text))); //解密
?>
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希望本文所述对大家PHP程序设计有所帮助。