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：

        if (is_array($type)) {            $result = array_map(array($this, 'is'), $type);            return count(array_filter($result)) > 0;        }

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:

require APP . 'Lib' . DS . 'Network' . DS . 'CakeRequest.php';//笔者的环境下不把这个也引进来的话，会导致Error:  Class 'CakeRequest' not found require 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:

<?php/** * 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 */class AppCakeRequest extends CakeRequest {/** * 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 $type The type of request you want to check. * @return boolean Whether or not the request is the type you are checking. */    public function is($type) {        //add str        if (is_array($type)) {            $result = array_map(array($this, 'is'), $type);            return count(array_filter($result)) > 0;        }        //add end        $type = strtolower($type);        if (!isset($this->_detectors[$type])) {            return false;        }        $detect = $this->_detectors[$type];        if (isset($detect['env'])) {            if (isset($detect['value'])) {                return env($detect['env']) == $detect['value'];            }            if (isset($detect['pattern'])) {                return (bool)preg_match($detect['pattern'], env($detect['env']));            }            if (isset($detect['options'])) {                $pattern = '/' . implode('|', $detect['options']) . '/i';                return (bool)preg_match($pattern, env($detect['env']));            }        }        if (isset($detect['param'])) {            $key = $detect['param'];            $value = $detect['value'];            return isset($this->params[$key]) ? $this->params[$key] == $value : false;        }        if (isset($detect['callback']) && is_callable($detect['callback'])) {            return call_user_func($detect['callback'], $this);        }        return false;    }    }

编辑app/webroot/index.php:

/*$Dispatcher->dispatch(    new CakeRequest(),    new CakeResponse());*/$Dispatcher->dispatch(    new AppCakeRequest(),    new CakeResponse(array('charset' => Configure::read('App.encoding'))));

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？