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<p>   <font color="red">再次说明：整个代码学习都是基于index.php，进行代码逐行分析。 根据报错，对照完整的源码进行文件补充。</font></p>
<h5 id="引入composer自动载入"><a href="#引入composer自动载入" class="headerlink" title="引入composer自动载入"></a>引入composer自动载入</h5><p>关于composer自动载入包的安装，只要的我们的根目录下新建composer.json,并写入<br><figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">"require" : { </span><br><span class="line"> "php" : ">=5.5.9"</span><br><span class="line">}</span><br></pre></td></tr></table></figure> 然后执行 <em>composer install</em> 命令</p>
<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></pre></td><td class="code"><pre><span class="line"><span class="comment">/**** 当前文件位置 index.php ****/</span></span><br><span class="line"><span class="keyword">require</span> <span class="keyword">__DIR__</span>.<span class="string">'/../bootstrap/autoload.php'</span>; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/**** 当前文件位置 bootstrap/autoload.php ****/</span></span><br><span class="line">define(<span class="string">'LARAVEL_START'</span>, microtime(<span class="keyword">true</span>));</span><br><span class="line"></span><br><span class="line"><span class="keyword">require</span> <span class="keyword">__DIR__</span>.<span class="string">'/../vendor/autoload.php'</span>; <span class="comment">// 引入Composer autoload</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//获取编译缓存，所有用到的类及方法的集合文件</span></span><br><span class="line"></span><br><span class="line">$compiledPath = <span class="keyword">__DIR__</span>.<span class="string">'/cache/compiled.php'</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">if</span> (file_exists($compiledPath)) { </span><br><span class="line"> <span class="keyword">require</span> $compiledPath;</span><br><span class="line">}</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<p>到这里,类文件的自动载入工作就算基本完成了。<br><a id="more"></a></p>
<h5 id="引入Application-php"><a href="#引入Application-php" class="headerlink" title="引入Application.php"></a>引入Application.php</h5><p>接下来会看到的代码就是<br><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">$app = <span class="keyword">new</span> Illuminate\Foundation\Application(</span><br><span class="line"> realpath(<span class="keyword">__DIR__</span>.<span class="string">'/../'</span>)</span><br><span class="line">);</span><br></pre></td></tr></table></figure></p>
<p>  首先需要创建 <em>vendor/laravel/framework/src/Illuminate/Foundation/Application.php </em>文件(建议为空类,测试自动引入是否成功)。那么通过composer自动引入Application.php？ 通过composer.json，定义路径,然后执行 <em>composer dump-autoload </em>命令。</p>
<figure class="highlight prolog"><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="string">"autoload"</span>: {</span><br><span class="line"> <span class="string">"classmap"</span>: [</span><br><span class="line"> <span class="string">"vendor/laravel/framework/src/Illuminate"</span>,</span><br><span class="line"> <span class="string">"app"</span></span><br><span class="line"></span><br><span class="line"> ],</span><br><span class="line"> <span class="string">"files"</span> : [</span><br><span class="line"> <span class="string">"vendor/laravel/framework/src/Illuminate/Support/helpers.php"</span>,</span><br><span class="line"> <span class="string">"vendor/laravel/framework/src/Illuminate/Foundation/helpers.php"</span></span><br><span class="line"> ],</span><br><span class="line"> <span class="string">"psr-4"</span>: {</span><br><span class="line"> <span class="string">"App\\"</span>: <span class="string">"app/"</span></span><br><span class="line"> }</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
<p>之后所有的文件载入不再做赘述,可自行参考以下资料:</p>
<blockquote><footer><strong>PHP中的PSR规范</strong><cite><a href="https://www.jianshu.com/p/b33155c15343" target="_blank" rel="noopener">www.jianshu.com/p/b33155c15343</a></cite></footer></blockquote>
<blockquote><footer><strong>composer文档</strong><cite><a href="https://docs.phpcomposer.com/01-basic-usage.html#Autoloading" target="_blank" rel="noopener">docs.phpcomposer.com/01-basic-usage.html#Autoloading</a></cite></footer></blockquote>
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