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request-instance.html
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<!DOCTYPE html>
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<meta name="description" content="laravel源码中request类生成流程及原理">
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<p>  通过index.php继续往下走, Request实例的初始化<br><figure class="highlight elixir"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="variable">$request</span> = Illuminate\Http\<span class="symbol">Request:</span><span class="symbol">:capture</span>()</span><br></pre></td></tr></table></figure><br>使用拓展 Symfony/Http-Foundation<br><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">use</span> <span class="title">Symfony</span>\<span class="title">Component</span>\<span class="title">HttpFoundation</span>\<span class="title">Request</span> <span class="title">as</span> <span class="title">SymfonyRequest</span>;</span><br><span class="line"><span class="keyword">public</span> <span class="keyword">static</span> <span class="function"><span class="keyword">function</span> <span class="title">capture</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{ </span><br><span class="line"> <span class="comment">//允许请求方法重新,主要用于DELETE PUT方法的最终转换</span></span><br><span class="line"> <span class="keyword">static</span>::enableHttpMethodParameterOverride();</span><br><span class="line"> </span><br><span class="line"> <span class="comment">//根据php超级全局变量$_SERVER的数据,创建一个Request 类</span></span><br><span class="line"> $fromGlobals = SymfonyRequest::createFromGlobals(); </span><br><span class="line"> <span class="comment">//最终返回 Illuminate\Http\Request类</span></span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">static</span>::createFromBase($fromGlobals); </span><br><span class="line">}</span><br></pre></td></tr></table></figure><br><a id="more"></a><br>①设置enableHttpMethodParameterOverride = true， 因为框架在设置DELETE PUT 等请求时,实质是通过表单伪造完成的《input type=”hidden” name=”_method” value=”PUT”》<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></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">getMethod</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">null</span> === <span class="keyword">$this</span>->method) {</span><br><span class="line"> <span class="keyword">$this</span>->method = strtoupper(<span class="keyword">$this</span>->server->get(<span class="string">'REQUEST_METHOD'</span>, <span class="string">'GET'</span>));</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="string">'POST'</span> === <span class="keyword">$this</span>->method) {</span><br><span class="line"> <span class="keyword">if</span> ($method = <span class="keyword">$this</span>->headers->get(<span class="string">'X-HTTP-METHOD-OVERRIDE'</span>)) {</span><br><span class="line"> <span class="keyword">$this</span>->method = strtoupper($method);</span><br><span class="line"> } <span class="keyword">elseif</span> (<span class="keyword">self</span>::$httpMethodParameterOverride) {</span><br><span class="line"> <span class="keyword">$this</span>->method = strtoupper(<span class="keyword">$this</span>->request->get(<span class="string">'_method'</span>, <span class="keyword">$this</span>->query->get(<span class="string">'_method'</span>, <span class="string">'POST'</span>)));</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">$this</span>->method;</span><br><span class="line">}</span><br></pre></td></tr></table></figure><br>②$fromGlobals实质是SymfonyRequest类。<font color="#f56954">其属性值本身源于PHP自带的超级全局变量$_SERVER。</font></p>
<p>③最后是通过duplicate方法,将SymfonyRequest属性值复制到Illuminate\Http\Request类中,并最终返回。</p>
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