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ReflectionClass:PHP中的反照类

Jun 13, 2016 pm 01:01 PM
function nbsp plugin

ReflectionClass:PHP中的反射类
interface Iplugin{
public static function getName();
}
function findPlugins(){
$plugins = array();
foreach (get_declared_classes() as $class){
$reflectionClass = new ReflectionClass($class);
if ($reflectionClass->implementsInterface('Iplugin')) {
$plugins[] = $reflectionClass;
}
}
return $plugins;
}
function computeMenu(){
$menu = array();
foreach (findPlugins() as $plugin){
if ($plugin->hasMethod('getMenuItems')) {
$reflectionMethod = $plugin->getMethod('getMenuItems');
if ($reflectionMethod->isStatic()) {
$items = $reflectionMethod->invoke(null);
} else {
$pluginInstance = $plugin->newInstance();
$items = $reflectionMethod->invoke($pluginInstance);
}
$menu = array_merge($menu,$items);
}
}
return $menu;
}
function computeArticles(){
$articles = array();
foreach (findPlugins() as $plugin){
if ($plugin->hasMethod('getArticles')) {
$reflectionMethod = $plugin->getMethod('getArticles');
if ($reflectionMethod->isStatic()) {
$items = $reflectionMethod->invoke(null);
} else {
$pluginInstance = $plugin->newInstance();
$items = $reflectionMethod->invoke($pluginInstance);
}
$articles = array_merge($articles,$items);
}
}
return $articles;
}
require_once('plugin.php');
$menu = computeMenu();
$articles = computeArticles();
print_r($menu);
print_r($articles);
//plugin.php 代码如下
class MycoolPugin implements Iplugin {
public static function getName(){
return 'MycoolPlugin';
}
public static function getMenuItems(){
return array(array('description'=>'MycoolPlugin','link'=>'/MyCoolPlugin'));
}
public static function getArticles(){
return array(array('path'=>'/MycoolPlugin','title'=>'This is a really cool article','text'=>xxxxxxxxx));
}
}上述代码是php反射类的一个应用。
什么是php反射类,顾名思义,可以理解为一个类的映射。
举个例子:

class fuc {        //定义一个类
static function ec() {
echo '我是一个类';
}
}
$class=new ReflectionClass('fuc');    //建立 fuc这个类的反射类
至于$class 这反射类里有什么东东,可以查看手册,这里不详解了

$fuc=$class->newInstance();  //相当于实例化 fuc 类
$fuc->ec(); //执行 fuc 里的方法ec

其中还有一些更高级的用法

$ec=$class->getmethod('ec');  //获取fuc 类中的ec方法
$fuc=$class->newInstance();  //实例化
$ec->invoke($fuc);      //执行ec 方法
上面的过程很熟悉吧。其实和调用对象的方法类似
只不过这里是反着来的,方法在前,对象在后

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