php字符串加解密

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第一步：先创建一个工具类

<?php/*工具类,不涉及第三方php*/class UtilClass{private function keyED($txt,$encrypt_key)   {       $encrypt_key =    md5($encrypt_key);$ctr=0;       $tmp = "";       for($i=0;$i<strlen($txt);$i++)       {           if ($ctr==strlen($encrypt_key))$ctr=0;           $tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1);$ctr++;       }       return $tmp;   }    /*加密*/public function encrypt($txt,$key)   {srand((double)microtime()*1000000);       $encrypt_key = md5(rand(0,32000));$ctr=0;       $tmp = "";       for ($i=0;$i<strlen($txt);$i++)        {if ($ctr==strlen($encrypt_key))$ctr=0;           $tmp.=substr($encrypt_key,$ctr,1) . (substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1));$ctr++;        }        return $this->keyED($tmp,$key);} /*加密并用base64编码显示*/public function encrypt_base64($txt,$key){return base64_encode($this->encrypt($txt,$key));}/*解密 注：decrypt和encrypt来源于网络*/public function decrypt($txt,$key){       $txt = $this->keyED($txt,$key);       $tmp = "";       for($i=0;$i<strlen($txt);$i++)       {           $md5 = substr($txt,$i,1);$i++;           $tmp.= (substr($txt,$i,1) ^ $md5);       }       return $tmp;} public function decrypt_base64($txt,$key){return $this->decrypt(base64_decode($txt),$key);}/*获取GUID*/function GUID(){return strtoupper(md5(uniqid(mt_rand(), true)));}/*格式化GUID*/function GUID_Format($guid){$hyphen = chr(45);// "-"$guid =substr($guid, 0, 8).$hyphen.substr($guid, 8, 4).$hyphen.substr($guid,12, 4).$hyphen.substr($guid,16, 4).$hyphen.substr($guid,20,12);return $guid;}}?>

第二步：演示代码调用工具类

<?phpinclude_once('Techlong/Public/util.class.php');$util=new UtilClass();$guid=$util->GUID();?><html><head></head><body>GUID值:<?php echo $util->GUID_Format($guid)?>(做为密匙)<br><br>原值：<input type="text" id="input1_<?php echo $guid ?>" value="<?php $str='12345679'; echo $str; ?>"><br>密文：<input type="text" id="input2_<?php echo $guid ?>" value="<?php $encryptstr=$util->encrypt($str,$guid); echo $encryptstr; ?>"><br>解密：<input type="text" id="input3_<?php echo $guid ?>" value="<?php $decryptstr=$util->decrypt($encryptstr,$guid); echo $decryptstr; ?>"><br><br>密文_base64：<input type="text" size="30" id="input4_<?php echo $guid ?>" value="<?php $encryptstr=$util->encrypt_base64($str,$guid); echo $encryptstr; ?>"><br>解密：<input type="text" id="input5_<?php echo $guid ?>" value="<?php $decryptstr=$util->decrypt_base64($encryptstr,$guid); echo $decryptstr; ?>"><br></body><html>

效果：

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