背景：cakephp开发环境版本是2.3.8，服务器的cakephp版本是2.3.5，测试好的代码上传到服务器上后发现总爆如下的警告：
Warning (2): strtolower() expects parameter 1 to be string, array given [CORE\Cake\Network\CakeRequest.php, line 478]
经过比对2.3.8和2.3.5发现，2.3.8比2.3.5的function is多了如下的代码：
<span if</span> (<span is_array</span>(<span $type</span><span )) {
</span><span $result</span> = <span array_map</span>(<span array</span>(<span $this</span>, 'is'), <span $type</span><span );
</span><span return</span> <span count</span>(<span array_filter</span>(<span $result</span>)) > 0<span ;
}</span>
虽然通过直接修改lib里的文件就能解决问题，但考虑到以后升级等问题，于是决定自定义这个CakeRequest，重写is函数。
过程如下：
在app/Config/bootstrap.php中加入如下代码:
<span require</span> APP . 'Lib' . DS . 'Network' . DS . 'CakeRequest.php'<span ;//笔者的环境下不把这个也引进来的话，会导致</span><span <strong>Error: </strong> Class 'CakeRequest' not found <br />require</span> APP . 'Lib' . DS . 'Network' . DS . 'AppCakeRequest.php';
在app/Lib/目录下新建Network目录, 将库里（lib/Cake/Network/）的CakeRequest.php拷贝至这个目录中，
然后在这个目录里添加AppCakeRequest.php:
<?<span php
</span><span /*</span><span *
* A class that helps wrap Request information and particulars about a single request.
* Provides methods commonly used to introspect on the request headers and request body.
*
* Has both an Array and Object interface. You can access framework parameters using indexes:
*
* `$request['controller']` or `$request->controller`.
*
* @package Cake.Network
</span><span */</span>
<span class</span> AppCakeRequest <span extends</span><span CakeRequest {
</span><span /*</span><span *
* Check whether or not a Request is a certain type. Uses the built in detection rules
* as well as additional rules defined with CakeRequest::addDetector(). Any detector can be called
* as `is($type)` or `is$Type()`.
*
* @param string $type The type of request you want to check.
* @return boolean Whether or not the request is the type you are checking.
</span><span */</span>
<span public</span> <span function</span> is(<span $type</span><span ) {
</span><span //</span><span add str</span>
<span if</span> (<span is_array</span>(<span $type</span><span )) {
</span><span $result</span> = <span array_map</span>(<span array</span>(<span $this</span>, 'is'), <span $type</span><span );
</span><span return</span> <span count</span>(<span array_filter</span>(<span $result</span>)) > 0<span ;
}
</span><span //</span><span add end</span>
<span $type</span> = <span strtolower</span>(<span $type</span><span );
</span><span if</span> (!<span isset</span>(<span $this</span>->_detectors[<span $type</span><span ])) {
</span><span return</span> <span false</span><span ;
}
</span><span $detect</span> = <span $this</span>->_detectors[<span $type</span><span ];
</span><span if</span> (<span isset</span>(<span $detect</span>['env'<span ])) {
</span><span if</span> (<span isset</span>(<span $detect</span>['value'<span ])) {
</span><span return</span> env(<span $detect</span>['env']) == <span $detect</span>['value'<span ];
}
</span><span if</span> (<span isset</span>(<span $detect</span>['pattern'<span ])) {
</span><span return</span> (bool)<span preg_match</span>(<span $detect</span>['pattern'], env(<span $detect</span>['env'<span ]));
}
</span><span if</span> (<span isset</span>(<span $detect</span>['options'<span ])) {
</span><span $pattern</span> = '/' . <span implode</span>('|', <span $detect</span>['options']) . '/i'<span ;
</span><span return</span> (bool)<span preg_match</span>(<span $pattern</span>, env(<span $detect</span>['env'<span ]));
}
}
</span><span if</span> (<span isset</span>(<span $detect</span>['param'<span ])) {
</span><span $key</span> = <span $detect</span>['param'<span ];
</span><span $value</span> = <span $detect</span>['value'<span ];
</span><span return</span> <span isset</span>(<span $this</span>->params[<span $key</span>]) ? <span $this</span>->params[<span $key</span>] == <span $value</span> : <span false</span><span ;
}
</span><span if</span> (<span isset</span>(<span $detect</span>['callback']) && <span is_callable</span>(<span $detect</span>['callback'<span ])) {
</span><span return</span> <span call_user_func</span>(<span $detect</span>['callback'], <span $this</span><span );
}
</span><span return</span> <span false</span><span ;
}
}</span>
编辑app/webroot/index.php:
<span /*</span><span
$Dispatcher->dispatch(
new CakeRequest(),
new CakeResponse()
);
</span><span */</span>
<span $Dispatcher</span>-><span dispatch(
</span><span new</span> AppCakeRequest(),
<span new</span> CakeResponse(<span array</span>('charset' => Configure::read('App.encoding'<span )))
);</span>
大功告成，错误不再爆了，偶是cakephp新手，欢迎拍砖。
参考：http://stackoverflow.com/questions/8554536/extending-the-cakerequest-object
最后吐槽一下，今天终于算是把这个项目做完了，半年前应朋友的邀，接下这个Cakephp的网站项目，
虽然工期很轻松，足足给了我大半年的时间，而且朋友的需求也是断断续续给我的。
以前从来没接触过php，更别说cakephp，而且国内cakephp的资料比较少，很多问题都得去英文或者日文雅虎上找答案。
有时候真的想shi的心都有啊。
这实在是太浪费自己的碎片时间了，以后再也不会接这种私活了。
有空余时间不如学习下自己感兴趣的知识不是？
