PHP基于反射机制实现插件的可插拔设计详解

interface IPlugin{
static function getname();
static function init();
static function getMenu();
}

<?php
Class Wele implements IPlugin{
static function getname(){
return 'Wele (Plugin)';
}
static function getMenu(){
return array(
'text'=>'插件1′,
'href'=>'http://.google.'
);
}
static function init(){
echo self::getname() . " 载入中…<br />";
}
}
?>

<?php
Class ShowAD implements IPlugin{
static function getname(){
return 'Show AD (Plugin)';
}
static function getMenu(){
return array(
'text'=>'插件2′,
'href'=>'http://.live.'
);
}
static function init(){
echo self::getname() . " 载入中…<br />";
}
}
?>

$menu[] = array(
'text'=>'首页',
'href'=>'/test.php'
);

$pluginPath = $_SERVER['DOCUMENT_ROOT'] . '/plugin';
$dirHd = opendir($pluginPath);
while ($file = readdir($dirHd)){
$pluginFilePath = $pluginPath . '/' . $file;
if($file!='.' && $file!='..' && is_file($pluginFilePath)){
include "$pluginFilePath";
}
}

// 反射执行方法(注入菜单)
foreach (get_declared_classes() as $class){
$refClass = new ReflectionClass($class);
if($refClass->implementsInterface('IPlugin')){
//插件初始化
$refClass->getMethod('init')->invoke(null);
//获取注入菜单
$menuItem = $refClass->getMethod('getMenu')->invoke(null);
//合并菜单项
$menu = array_merge($menu, array($menuItem));
}
}

foreach ($menu as $m){
echo "<a href='{$m['href']}'>{$m['text']}</a> ";
}

$refClass = new ReflectionClass($class);
$menuItem = $refClass->getMethod('getMenu')->invoke(null);