对thinkPHP中U方法加密传递参数的功能解析

<?php
/**
 * 简单对称加密算法之加密
 * @param String $string 需要加密的字串
 * @param String $skey 加密EKY
 */
function encode($string = &#39;&#39;, $skey = &#39;yourkey&#39;) {
 $strArr = str_split(base64_encode($string));
 $strCount = count($strArr);
 foreach (str_split($skey) as $key => $value)
  $key < $strCount && $strArr[$key].=$value;
 return str_replace(array(&#39;=&#39;, &#39;+&#39;, &#39;/&#39;), array(&#39;O0O0O&#39;, &#39;o000o&#39;, &#39;oo00o&#39;), join(&#39;&#39;, $strArr));
}
/**
 * 简单对称加密算法之解密
 * @param String $string 需要解密的字串
 * @param String $skey 解密KEY
 */
function decode($string = &#39;&#39;, $skey = &#39;yourkey&#39;) {
 $strArr = str_split(str_replace(array(&#39;O0O0O&#39;, &#39;o000o&#39;, &#39;oo00o&#39;), array(&#39;=&#39;, &#39;+&#39;, &#39;/&#39;), $string), 2);
 $strCount = count($strArr);
 foreach (str_split($skey) as $key => $value)
  $key <= $strCount && $strArr[$key][1] === $value && $strArr[$key] = $strArr[$key][0];
 return base64_decode(join(&#39;&#39;, $strArr));
}
/**
将以上两个函数放在Common下的function.php公共函数中。
用法：常用语get传参
 前端：<a href="<{:U(&#39;Index/view&#39;,array(&#39;id&#39;=>encode($data[&#39;id&#39;]),&#39;name&#39;=>encode($data[&#39;title&#39;])))}>" rel="external nofollow" ><{$data.title}></a>
 后台：view方法中：$id = decode(trim(I("get.id")));即可还原
 view模板中：<font color="red"><{$Think.get.name|decode}></font>
**/
/*建议将key自行修改，尽量不要太长，不然url很长，适当即可，加密性能很好，亲测*/