一般在框架中都会用到 composer 工具 , 用它来管理依赖。其中 composer 有类的自动加载机制,可以加载 composer 下载的库中的所有的类文件。那么 composer 的自动加载机制是怎么实现的呢?
以在 laravel 框架中为例:
```
require __dir__.'/../vendor/autoload.php';
```
```
require_once __dir__ . '/composer/autoload_real.php';
return composerautoloaderinit1215780529014c2b50a6fca7ce889273::getloader();
```
```
<?php
// autoload_real.php @generated by composer
class composerautoloaderinit1215780529014c2b50a6fca7ce889273
{
private static $loader;
public static function loadclassloader($class)
{
if ('composer\autoload\classloader' === $class) {
require __dir__ . '/classloader.php';
}
}
public static function getloader()
{
if (null !== self::$loader) {
return self::$loader;
}
spl_autoload_register(array('composerautoloaderinit1215780529014c2b50a6fca7ce889273', 'loadclassloader'), true, true);
self::$loader = $loader = new \composer\autoload\classloader();
spl_autoload_unregister(array('composerautoloaderinit1215780529014c2b50a6fca7ce889273', 'loadclassloader'));
$usestaticloader = php_version_id >= 50600 && !defined('hhvm_version') && (!function_exists('zend_loader_file_encoded') || !zend_loader_file_encoded());
if ($usestaticloader) {
require_once __dir__ . '/autoload_static.php';
call_user_func(\composer\autoload\composerstaticinit1215780529014c2b50a6fca7ce889273::getinitializer($loader));
} else {
$map = require __dir__ . '/autoload_namespaces.php';
foreach ($map as $namespace => $path) {
$loader->set($namespace, $path);
}
$map = require __dir__ . '/autoload_psr4.php';
foreach ($map as $namespace => $path) {
$loader->setpsr4($namespace, $path);
}
$classmap = require __dir__ . '/autoload_classmap.php';
if ($classmap) {
$loader->addclassmap($classmap);
}
}
$loader->register(true);
if ($usestaticloader) {
$includefiles = composer\autoload\composerstaticinit1215780529014c2b50a6fca7ce889273::$files;
} else {
$includefiles = require __dir__ . '/autoload_files.php';
}
foreach ($includefiles as $fileidentifier => $file) {
composerrequire1215780529014c2b50a6fca7ce889273($fileidentifier, $file);
}
return $loader;
}
}
function composerrequire1215780529014c2b50a6fca7ce889273($fileidentifier, $file)
{
if (empty($globals['__composer_autoload_files'][$fileidentifier])) {
require $file;
$globals['__composer_autoload_files'][$fileidentifier] = true;
}
}
```
可以看出这一段是 composer 自动加载的重点,首先在 autoload.php 中调用
composerautoloaderinit1215780529014c2b50a6fca7ce889273::getloader () 方法,getloader () 首先判断当前
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