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 "jb51.net";
?>

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
jb51.net