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<p>   index.php 的最后两行代码。整体流程结束。<br><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//index.php</span></span><br><span class="line">$response->send(); <span class="comment">// 发送响应</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// 循环遍历kernel里所有中间件和当前路由所用中间件, 如果terminate方法存在,则执行</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//app->terminate(), 执行 全局terminate 方法</span></span><br><span class="line">$kernel->terminate($request, $response);</span><br></pre></td></tr></table></figure></p>
<h4 id="sendResponse"><a href="#sendResponse" class="headerlink" title="sendResponse"></a>sendResponse</h4><p>$response 为 Illuminate\Http\Response类,继承插件BaseResponse类<br><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//插件 symfony/http-foundation</span></span><br><span class="line">use <span class="type">Symfony</span>\<span class="type">Component</span>\<span class="type">HttpFoundation</span>\<span class="type">Response</span> as <span class="type">BaseResponse</span>;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Response</span> <span class="keyword">extends</span> <span class="title">BaseResponse</span></span></span><br></pre></td></tr></table></figure><br><a id="more"></a><br>使用父类Symfony\Component\HttpFoundation\Response的send<br><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">send</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">$this</span>->sendHeaders(); <span class="comment">//设置响应头信息</span></span><br><span class="line"> <span class="keyword">$this</span>->sendContent(); </span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (function_exists(<span class="string">'fastcgi_finish_request'</span>)) {</span><br><span class="line"> fastcgi_finish_request();</span><br><span class="line"> } <span class="keyword">elseif</span> (!\in_array(PHP_SAPI, <span class="keyword">array</span>(<span class="string">'cli'</span>, <span class="string">'phpdbg'</span>), <span class="keyword">true</span>)) {</span><br><span class="line"> <span class="comment">//与apache之间响应信息交互完毕。无法继续使用header()函数</span></span><br><span class="line"> <span class="keyword">static</span>::closeOutputBuffers(<span class="number">0</span>, <span class="keyword">true</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">$this</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h4 id="sendContent"><a href="#sendContent" class="headerlink" title="sendContent"></a>sendContent</h4><p>Illuminate\Http\Response里的sendContent。如果content是Renderable实例，也就是在路由控制器中执行了return view()。需要就content进行视图编译后，将其赋值为静态html文件。<br><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">setContent</span><span class="params">($content)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">$this</span>->original = $content;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">$this</span>->shouldBeJson($content)) {</span><br><span class="line"> <span class="keyword">$this</span>->header(<span class="string">'Content-Type'</span>, <span class="string">'application/json'</span>);</span><br><span class="line"></span><br><span class="line"> $content = <span class="keyword">$this</span>->morphToJson($content);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">//视图类 则执行模板编译</span></span><br><span class="line"> <span class="keyword">elseif</span> ($content <span class="keyword">instanceof</span> Renderable) {</span><br><span class="line"> <span class="comment">// 获取编译完成的视图 HTML 文件</span></span><br><span class="line"> $content = $content->render();</span><br><span class="line"> </span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">parent</span>::setContent($content);</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h4 id="terminate"><a href="#terminate" class="headerlink" title="terminate"></a>terminate</h4><p>此时response已返回成功，terminate为后续操作。会逐一执行所有中间的terminate方法。<br><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">terminate</span><span class="params">($request, $response)</span></span></span><br><span class="line"><span class="function"></span>{ </span><br><span class="line"> <span class="comment">//当前this为kernel </span></span><br><span class="line"> $middlewares = <span class="keyword">$this</span>->app->shouldSkipMiddleware() ? [] : array_merge(</span><br><span class="line"> <span class="keyword">$this</span>->gatherRouteMiddlewares($request), <span class="comment">//当前路由中间件</span></span><br><span class="line"> <span class="keyword">$this</span>->middleware <span class="comment">//kernel中间件</span></span><br><span class="line"> );</span><br><span class="line"> <span class="keyword">foreach</span> ($middlewares <span class="keyword">as</span> $middleware) {</span><br><span class="line"> <span class="keyword">list</span>($name, $parameters) = <span class="keyword">$this</span>->parseMiddleware($middleware);</span><br><span class="line"></span><br><span class="line"> $instance = <span class="keyword">$this</span>->app->make($name); </span><br><span class="line"> <span class="comment">// 通过容器获取中间件实例,执行方法terminate()</span></span><br><span class="line"> <span class="keyword">if</span> (method_exists($instance, <span class="string">'terminate'</span>)) {</span><br><span class="line"> $instance->terminate($request, $response);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">$this</span>->app->terminate();</span><br><span class="line">}</span><br></pre></td></tr></table></figure><br>比如执行 StartSession 中间件的 terminate方法,最终保存session。<br><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"> \Illuminate\Session\Middleware\StartSession</span><br><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">terminate</span><span class="params">($request, $response)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">$this</span>->sessionHandled && <span class="keyword">$this</span>->sessionConfigured() && ! <span class="keyword">$this</span>->usingCookieSessions()) {</span><br><span class="line"> <span class="keyword">$this</span>->manager->driver()->save();</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
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