Analyze the application of reflection in php

1 The use of reflection:

<?php
class Person{
 public $name;
 function __construct($name){
  $this->name=$name;
 }
}
interface Module{
 function execute();
}
class FtpModule implements Module{
 function setHost($host){
  print "FtpModule::setHost():$host\n";
 }
 function setUser($user){
  print "FtpModule::setUser():$user\n";
 }
 function execute(){
  //something
 }
}
class PersonModule implements Module{
 function setPerson(Person $person){
  print "PersonModule::setPerson:{$person->name}\n";
 }
 function execute(){
  //something
 }
}
class ModuleRunner{
 private $configData
        =array(
          "PersonModule"=>array(&#39;person&#39;=>&#39;bob&#39;),
          "FtpModule"=>array(&#39;host&#39;=>&#39;example.com&#39;,&#39;user&#39;=>&#39;anon&#39;)
        );
 private $modules=array();
 function init(){
  $interface=new ReflectionClass(&#39;Module&#39;);
  foreach($this->configData as $modulename=>$params){
   $module_class=new ReflectionClass($modulename);//根据配置configData的名称，实例化ReflectionClass
   if(!$module_class->isSubclassOf($interface)){//检查反射得到了类是否是$interface的子类
    throw new Exception("unknown module type:$modulename");//不是Module子类则抛出异常
   }
   $module=$module_class->newInstance();//实例化一个FtpModule或者PersonModule对象
   foreach($module_class->getMethods() as $method){//获得类中的方法
    $this->handleMethod($module,$method,$params);
   }
   array_push($this->modules,$module);//将实例化的module对象放入$modules数组中
  }
 }
 function handleMethod(Module $module,ReflectionMethod $method,$params){
  $name=$method->getName();//获得方法名称
  $args=$method->getParameters();//获得方法中的参数
  if(count($args)!=1||substr($name,0,3)!="set"){//检查方法必须是以set开头，且只有一个参数
   return false;
  }
  $property=strtolower(substr($name,3));//讲方法名去掉set三个字母，作为参数
  if(!isset($params[$property])){//如果$params数组不包含某个属性，就返回false
   return false;
  }
  $arg_class=@$args[0]->getClass;//检查setter方法的第一个参数（且唯一）的数据类型
  if(empty($arg_class)){
   $method->invoke($module,$params[$property]);
  }else{
   $method->invoke($module,$arg_class->newInstance($params[$property]));
  }
 }
}
$test=new ModuleRunner();
$test->init();
?>

2 Obtaining information in the class through reflection:

<PRE class=php name="code"><?php
class ReflectionUtil{
 static function getClassSource(ReflectionClass $class){
  $path=$class->getFileName();
  $lines=@file($path);
  $from=$class->getStartLine();
  $to=$class->getEndLine();
  $len=$to-$from+1;
  return implode(array_slice($lines,$from-1,$len));
 }
}
$classname="Person";
$path="../practice/{$classname}.php";
if(!file_exists($path)){
  throw new Exception("No such file as {$path}");
}
require_once($path);
if(!class_exists($classname)){
 throw new Exception("No such class as {$classname}");
}
print ReflectionUtil::getClassSource(new ReflectionClass(&#39;Person&#39;));
?>

结果是：class Person{ public $age; public $name; function getName(){return "zjx";} function getAge(){return 12;} function __toString(){ $rs=$this->getName(); $rs.="(age".$this->getAge().")"; return $rs; } }

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