PHP获取对象属性的三种方法实例分析

本文实例讲述了PHP获取对象属性的三种方法。分享给大家供大家参考，具体如下：

今天查看yii源码，发现yii/base/Model中的attribute()方法是通过反射获取对象的public non-static属性。记得以前看到的代码都是用get_object_vars()这个函数获取的，昨天查看php文档，发现还可以用foreach遍历对象属性。于是写个例子练习下。

class TestClass {  private $a;  protected $b;  public $c;  public $d;  public static $e;  private function funcA() {  }  protected function funcB() {  }  public function funcC() {  }  public function getPropertyMethodOne() {    echo "[get_object_vars]", PHP_EOL;    $vars = get_object_vars($this);    foreach ($vars as $k => $v) {      echo $k, ' => ', $v, PHP_EOL;    }  }  public function getPropertyMethodTwo() {    echo "[foreach object]", PHP_EOL;    foreach ($this as $k => $v) {      echo $k, ' => ', $v, PHP_EOL;    }  }  public function getPropertyMethodThree() {    echo "[reflection]", PHP_EOL;    $class = new ReflectionClass($this);    foreach ($class->getProperties(ReflectionProperty::IS_PUBLIC) as $property) {      if (!$property->isStatic()) {        echo $property->getName(), ' => ', $property->getValue($this), PHP_EOL;      }    }  }}

测试代码一

$obj = new TestClass();echo "[get_object_vars]", PHP_EOL;$vars = get_object_vars($obj);foreach ($vars as $k => $v) {  echo $k, ' => ', $v, PHP_EOL;}echo "[foreach object]", PHP_EOL;foreach ($obj as $k => $v) {  echo $k, ' => ', $v, PHP_EOL;}echo "[reflection]", PHP_EOL;$class = new ReflectionClass($obj);foreach ($class->getProperties(ReflectionProperty::IS_PUBLIC) as $property) {  if (!$property->isStatic()) {    echo $property->getName(), ' => ', $property->getValue($obj), PHP_EOL;  }}

输出：

[get_object_vars]
c =>
d =>
[foreach object]
c =>
d =>
[reflection]
c =>
d =>

可见，当着三种方法用在类的外部时，结果是一样的。get_object_vars()和foreach是获取到的是对象的public non-static属性，而通过反射的话则需要手动筛选出public non-static属性。

测试代码二

$obj = new TestClass();$obj->getPropertyMethodOne();$obj->getPropertyMethodTwo();$obj->getPropertyMethodThree();

输出

[get_object_vars]
a =>
b =>
c =>
d =>
[foreach object]
a =>
b =>
c =>
d =>
[reflection]
c =>
d =>

可见，get_object_vars()和foreach用在类内部时，private、protected、public的实例属性都能获取到。反射就不用说了，通过手动筛选，各种类型的属性都能获取到。