extends CakeRequest,重写is方法

        <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 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';

<?<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>

<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>