Yii笔记---redirect重定向
Yii的redirect方法在CControler与CHttpRequest之中都有被定义,CController中的redirect调用了CHttpRequest中的redirect方法。我们平常调用的是CControoler中的redirect方法
在framewok/web/CController中的定义
<span style="color: #008080;">1</span> <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span> redirect(<span style="color: #800080;">$url</span>,<span style="color: #800080;">$terminate</span>=<span style="color: #0000ff;">true</span>,<span style="color: #800080;">$statusCode</span>=302<span style="color: #000000;">)</span><span style="color: #008080;">2</span> <span style="color: #000000;">{</span><span style="color: #008080;">3</span> <span style="color: #0000ff;">if</span>(<span style="color: #008080;">is_array</span>(<span style="color: #800080;">$url</span><span style="color: #000000;">))</span><span style="color: #008080;">4</span> <span style="color: #000000;"> {</span><span style="color: #008080;">5</span> <span style="color: #800080;">$route</span>=<span style="color: #0000ff;">isset</span>(<span style="color: #800080;">$url</span>[0]) ? <span style="color: #800080;">$url</span>[0] : ''<span style="color: #000000;">;</span><span style="color: #008080;">6</span> <span style="color: #800080;">$url</span>=<span style="color: #800080;">$this</span>->createUrl(<span style="color: #800080;">$route</span>,<span style="color: #008080;">array_splice</span>(<span style="color: #800080;">$url</span>,1<span style="color: #000000;">));</span><span style="color: #008080;">7</span> <span style="color: #000000;"> }</span><span style="color: #008080;">8</span> Yii::app()->getRequest()->redirect(<span style="color: #800080;">$url</span>,<span style="color: #800080;">$terminate</span>,<span style="color: #800080;">$statusCode</span><span style="color: #000000;">);</span><span style="color: #008080;">9</span> }
参数说明:
[email protected]:指定浏览器跳转到的url链接,如果$url为数组,则数组的第一个元素是由控制器/方法【controller/action】组成,其余的部分被视为GET参数,name-value对并调用了createUrl方法生成url。如果是字符串 直接调用的framework/web/CHttpRequest.php中的redirect方法。
[email protected]:调用redirect之后是否终止当前的应用。
[email protected]:表示HTTP的状态码,默认是302重定向
关于array_splice函数:把数组中的一部分去掉并用其它值取代,上面的array_splice($url,1)表示的是将$url数组的第一个元素去掉,获取到GET参数的值
<span style="color: #0000ff;">array</span> <span style="color: #008080;">array_splice</span> ( <span style="color: #0000ff;">array</span> &<span style="color: #800080;">$input</span> , int <span style="color: #800080;">$offset</span> [, int <span style="color: #800080;">$length</span> = 0 [, <span style="color: #0000ff;">mixed</span> <span style="color: #800080;">$replacement</span> ]] )
关于createUrl函数:这个函数和redirect一样在多处有定义,分别在CController.php和CurlManager.php之中。最终的定义在CurlManager.php之中。
下面是CController中的createURL的定义:
<span style="color: #008080;"> 1</span> <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span> createUrl(<span style="color: #800080;">$route</span>,<span style="color: #800080;">$params</span>=<span style="color: #0000ff;">array</span>(),<span style="color: #800080;">$ampersand</span>='&'<span style="color: #000000;">)</span><span style="color: #008080;"> 2</span> <span style="color: #000000;"> {</span><span style="color: #008080;"> 3</span> <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$route</span>===''<span style="color: #000000;">)</span><span style="color: #008080;"> 4</span> <span style="color: #800080;">$route</span>=<span style="color: #800080;">$this</span>->getId().'/'.<span style="color: #800080;">$this</span>->getAction()-><span style="color: #000000;">getId();</span><span style="color: #008080;"> 5</span> <span style="color: #0000ff;">elseif</span>(<span style="color: #008080;">strpos</span>(<span style="color: #800080;">$route</span>,'/')===<span style="color: #0000ff;">false</span><span style="color: #000000;">)</span><span style="color: #008080;"> 6</span> <span style="color: #800080;">$route</span>=<span style="color: #800080;">$this</span>->getId().'/'.<span style="color: #800080;">$route</span><span style="color: #000000;">;</span><span style="color: #008080;"> 7</span> <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$route</span>[0]!=='/' && (<span style="color: #800080;">$module</span>=<span style="color: #800080;">$this</span>->getModule())!==<span style="color: #0000ff;">null</span><span style="color: #000000;">)</span><span style="color: #008080;"> 8</span> <span style="color: #800080;">$route</span>=<span style="color: #800080;">$module</span>->getId().'/'.<span style="color: #800080;">$route</span><span style="color: #000000;">;</span><span style="color: #008080;"> 9</span> <span style="color: #0000ff;">return</span> Yii::app()->createUrl(<span style="color: #008080;">trim</span>(<span style="color: #800080;">$route</span>,'/'),<span style="color: #800080;">$params</span>,<span style="color: #800080;">$ampersand</span><span style="color: #000000;">);</span><span style="color: #008080;">10</span> }
从这里可以看出来几种情况:
1、如果redirect没有带参数则$route为空的情况,会被定向到 当前控制器的当前方法 $route=$this->getId().'/'.$this->getAction()->getId();
2、如果$route中不带‘/’,例如 $this->render('index',array('post'=>$questions));只接了方法而没有控制器,程序会自动获取到当前的控制器方法ID
3、route中有‘/’字符,但是不在首位置,并且查找当前控制器是否位于模块之中;例如 $this->redirect(array('step/show','id'=>1)); 这种情况程序会自动判断是否是模块,我们在调用createUrl的时候就可以不用跟上模块的名称,如果在模块中调用主控制器中的方法时 我们可以在首字母处加上'/'字符。并且程序在最后都会去掉$route前后的/字符。
在framework/web/CHttpRequest.php中的定义
<span style="color: #008080;">1</span> <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span> redirect(<span style="color: #800080;">$url</span>,<span style="color: #800080;">$terminate</span>=<span style="color: #0000ff;">true</span>,<span style="color: #800080;">$statusCode</span>=302<span style="color: #000000;">)</span><span style="color: #008080;">2</span> <span style="color: #000000;"> {</span><span style="color: #008080;">3</span> <span style="color: #0000ff;">if</span>(<span style="color: #008080;">strpos</span>(<span style="color: #800080;">$url</span>,'/')===0 && <span style="color: #008080;">strpos</span>(<span style="color: #800080;">$url</span>,'//')!==0<span style="color: #000000;">)</span><span style="color: #008080;">4</span> <span style="color: #800080;">$url</span>=<span style="color: #800080;">$this</span>->getHostInfo().<span style="color: #800080;">$url</span><span style="color: #000000;">;</span><span style="color: #008080;">5</span> <span style="color: #008080;">header</span>('Location: '.<span style="color: #800080;">$url</span>, <span style="color: #0000ff;">true</span>, <span style="color: #800080;">$statusCode</span><span style="color: #000000;">);</span><span style="color: #008080;">6</span> <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$terminate</span><span style="color: #000000;">)</span><span style="color: #008080;">7</span> Yii::app()-><span style="color: #008080;">end</span><span style="color: #000000;">();</span><span style="color: #008080;">8</span> }
如果CController之中的redirect的$url参数不是数组,则会直接调用该函数,如果$url不是以'/'开头则会直接跳转,这种情况导致在模块中重定向失败,所以建议在调用CController.php之中redirect方法时都是用数组作为参数进行传递
从这可以看出redirect方法最终还是调用的php原生态的header函数
Yii::app()->end(); 直接调用的是php的exit()函数。

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