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。
<?php
require 'flight/Flight.php';
Flight::route('/', function(){
echo 'hello world!';
});
Flight::start();
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() {}
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
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);
}
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;
}
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__));
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();
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 $file;
return;
}
}
}
接下来我们试着按照flight自动加载的方式,写个简单的自动加载进行测试:
/autoload/index.php
<?php
class MyClass{
public static function __callStatic($name, $params){
self::app();
}
public static function app(){
require_once __DIR__.'/Loader.php';
Loader::autoload(true, dirname(__DIR__));
new \autoload\Test();
}
}
MyClass::test();
new \autoload\Test2();
var_dump(Loader::getClasses());//array(2) { [0]=> string(36) "/usr/local/var/www/autoload/Test.php" [1]=> string(37) "/usr/local/var/www/autoload/Test2.php" }
/autoload/Loader.php
<?php
class Loader {
public static $dirs = [];
public static $classes = [];
public static function autoload($enabled=true, $dirs=[]) {
if ($enabled) {
spl_autoload_register([__CLASS__, 'loadClass']);
} else {
spl_autoload_unregister([__CLASS__, 'loadClass']);
}
if (!empty($dirs)) {
self::addDirectory($dirs);
}
}
public static function loadClass($class) {
$class_file = str_replace(['\\', '_'], '/', $class).'.php';
foreach (self::$dirs as $dir) {
$file = $dir.'/'.$class_file;
if (file_exists($file)) {
require $file;
self::$classes[] = $file;
return;
}
}
}
public static function addDirectory($dir) {
if (is_array($dir) || is_object($dir)) {
foreach ($dir as $value) {
self::addDirectory($value);
}
}
else if (is_string($dir)) {
if (!in_array($dir, self::$dirs)) self::$dirs[] = $dir;
}
}
public static function getClasses(){
return self::$classes;
}
}
/autoload/Test.php
<?php
namespace autoload;
class Test {}
/autoload/Test2.php
<?php
namespace autoload;
class Test2 {}
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