Java类反射应用得非常广泛几乎是所有框架的最核心部分，PHP程序员似乎从不关心反射。尝试着用java的思想去理解php的反射，跟java基本上基本一致。参考了php手册：http://www.php.net/manual/zh/book.reflection.php。

ReflectTest.php:

<?php
class ReflectTest {
	/**
	 * 用户ID
	 */
	private $userId;
	/**
	 * 用户名
	 */
	private $userName;
	/**
	 * 用户密码
	 */
	private $password;
	/**
	 * 用户邮箱
	 */
	private $email;
	/**
	 * 用户QQ号码
	 */
	private $qq;
	/**
	 * 登陆次数
	 */
	private $loginTimes;
	public function ReflectTest(){
	}
	public function __construct($userId,$userName,$password){
		$this->userId = $userId;
		$this->userName = $userName;
		$this->password = $password;
	}
	/**
	 *
	 * @return the $userId
	 */
	public function getUserId() {
		return $this->userId;
	}
	/**
	 *
	 * @return the $userName
	 */
	public function getUserName() {
		return $this->userName;
	}
	/**
	 *
	 * @return the $password
	 */
	public function getPassword() {
		return $this->password;
	}
	/**
	 *
	 * @return the $email
	 */
	public function getEmail() {
		return $this->email;
	}
	/**
	 *
	 * @return the $qq
	 */
	public function getQq() {
		return $this->qq;
	}
	/**
	 *
	 * @return the $loginTimes
	 */
	public function getLoginTimes() {
		return $this->loginTimes;
	}
	/**
	 *
	 * @param field_type $userId        	
	 */
	public function setUserId($userId) {
		$this->userId = $userId;
	}
	/**
	 *
	 * @param field_type $userName        	
	 */
	public function setUserName($userName) {
		$this->userName = $userName;
	}
	/**
	 *
	 * @param field_type $password        	
	 */
	public function setPassword($password) {
		$this->password = $password;
	}
	/**
	 *
	 * @param field_type $email        	
	 */
	public function setEmail($email) {
		$this->email = $email;
	}
	/**
	 *
	 * @param field_type $qq        	
	 */
	public function setQq($qq) {
		$this->qq = $qq;
	}
	/**
	 *
	 * @param field_type $loginTimes        	
	 */
	public function setLoginTimes($loginTimes) {
		$this->loginTimes = $loginTimes;
	}
}
?>

Test.php:

<?php
	require_once 'ReflectTest.php';
	$ref = new ReflectTest("1", "admin", "admin888");//实例化ReflectTest
	echo "<h1>ReflectTest init.</h1><br/>UserId:".$ref->getUserId()."<br/>UserName:".$ref->getUserName()."<br/>Password:".$ref->getPassword();
	$class = new ReflectionClass('ReflectTest');//反射加载ReflectTest类
	$instance  = $class->newInstanceArgs(array('123','root','123456'));//ReflectTest初始化
	echo "<h1>Field:</h1><br/>";
	$field = $class->getProperties();
	foreach($field as $f) {
		echo $f->getName()."<br/>";//反射输出所有的成员变量
	}
	echo "<h1>get Fields DocComment:</h1><br/>";
	foreach($field as $f) {
		$docComment = $f->getDocComment();//反射输出所有成员变量的文档注释
		echo $docComment."<br/>";
	}
	$method = $class->getMethods();//获取ReflectTest所有方法
	echo "<h1>get Methods DocComment:</h1><br/>";
	foreach($method as $m) {
		$docComment = $m->getDocComment();//获取所有方法的文档注释
		echo $docComment."<br/>";
	}
	echo "<h1>get Methods:</h1><br/>";
	foreach($method as $m) {
		$k = "get";//只调ReflectTest中的所有的get方法
		echo $m->getName()."=".($k === "" || strpos ( $m->getName (), $k ) === 0?$m->invoke($instance):"")."<br/>";
		if("setQq"==$m->getName()){
			$m->invoke($instance,'441637262');//调用setQq方法为ReflectTest当中的成员变量qq设值
		}
	}
	echo "<h1>Invoke (set/get)Qq result:</h1><br/>";
	$qq=$class->getmethod('getQq');//获取getQq方法
	echo "getQQ:".$qq->invoke($instance)."<br/>";//获取成员变量qq的值
	echo "p2j.cn";
?>

请求http://localhost/php/test/Test.php输出结果：

ReflectTest init.
UserId:1
UserName:admin
Password:admin888
Field:
userId
userName
password
email
qq
loginTimes
get Fields DocComment:
/** * 用户ID */
/** * 用户名 */
/** * 用户密码 */
/** * 用户邮箱 */
/** * 用户QQ号码 */
/** * 登陆次数 */
get Methods DocComment:
/** * * @return the $userId */
/** * * @return the $userName */
/** * * @return the $password */
/** * * @return the $email */
/** * * @return the $qq */
/** * * @return the $loginTimes */
/** * * @param field_type $userId */
/** * * @param field_type $userName */
/** * * @param field_type $password */
/** * * @param field_type $email */
/** * * @param field_type $qq */
/** * * @param field_type $loginTimes */
get Methods:
ReflectTest=
__construct=
getUserId=123
getUserName=root
getPassword=123456
getEmail=
getQq=
getLoginTimes=
setUserId=
setUserName=
setPassword=
setEmail=
setQq=
setLoginTimes=
Invoke (set/get)Qq result:
getQQ:441637262
p2j.cn