Analysis of automatic loading of flight source code in PHP micro-framework-PHP Tutorial-php.cn

这篇文章给大家分享的内容是关于php微框架中flight源码的自动加载的解析，有一定的参考价值，有需要的朋友可以参考一下。

先来看下框架的单入口文件index.php，先引入了Flight.php框架类文件。


        
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Flight.php中定义了Flight类，类里面先定义了3个魔术方法，这三个魔术方法是为了防止当前类被实例化

// Don't allow object instantiation private function __construct() {} private function __destruct() {} private function __clone() {}

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如果试着去new Flight会提示如下错误：

Fatal error: Uncaught Error: Call to private Flight::__construct() from invalid context in /usr/local/var/www/flight135/index.php:3 Stack trace: #0 {main} Next Error: Call to private Flight::__destruct() from context '' in /usr/local/var/www/flight135/index.php:3 Stack trace: #0 {main} thrown in /usr/local/var/www/flight135/index.php on line 3

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接着定义了一个重载方法__callStatic()，在index.php中执行Flight::route('/', 'hello')就会调用该__callStatic，其中$name就是'route'，$params就是自己写的hello函数。在__callStatic()中调用了当前类的app()静态方法，这里为什么不使用self::app()来调用呢？

/** * Handles calls to static methods. * * @param string $name Method name * @param array $params Method parameters * @return mixed Callback results * @throws \Exception */ public static function __callStatic($name, $params) { $app = Flight::app(); return \flight\core\Dispatcher::invokeMethod(array($app, $name), $params); }

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接着就是在static app()中开始处理自动加载了

/** * @return \flight\Engine Application instance */ public static function app() { static $initialized = false; if (!$initialized) { require_once __DIR__.'/autoload.php'; self::$engine = new \flight\Engine(); $initialized = true; } return self::$engine; }

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进入到autoload.php来看，引入了core目录下的Loader.php类文件，Loader就是加载器。

autoload.php require_once __DIR__.'/core/Loader.php'; \flight\core\Loader::autoload(true, dirname(__DIR__));

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Loader中定义了加载存放哪些类型：$classes(类路径数组),$instances(对象数组),$dirs(框架目录路径数组)

/** * Registered classes. * * @var array */ protected $classes = array(); /** * Class instances. * * @var array */ protected $instances = array(); /** * Autoload directories. * * @var array */ protected static $dirs = array();

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autoload()中使用spl_autoload_register将当前类（__CLASS__）中的loadClass方法注册为加载的执行方法。

/** * Starts/stops autoloader. * * @param bool $enabled Enable/disable autoloading * @param array $dirs Autoload directories */ public static function autoload($enabled = true, $dirs = array()) { if ($enabled) { spl_autoload_register(array(__CLASS__, 'loadClass')); } else { spl_autoload_unregister(array(__CLASS__, 'loadClass')); } if (!empty($dirs)) { self::addDirectory($dirs); } } /** * Autoloads classes. * * @param string $class Class name */ public static function loadClass($class) { $class_file = str_replace(array('\\', '_'), '/', $class).'.php'; foreach (self::$dirs as $dir) { $file = $dir.'/'.$class_file; if (file_exists($file)) { require $file; return; } } }

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接下来我们试着按照flight自动加载的方式，写个简单的自动加载进行测试：

/autoload/index.php  string(36) "/usr/local/var/www/autoload/Test.php" [1]=> string(37) "/usr/local/var/www/autoload/Test2.php" } /autoload/Loader.php 
        
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