PHP獲取對象屬性的三種方法

今天查看yii源碼，發現yiiaseModel中的attribute()方法是通過反射獲取對象的public non-static屬性。記得以前看到的代碼都是用get_object_vars()這個函數獲取的，昨天查看php文檔，發現還可以用foreach遍歷對象屬性。於是寫個例子練習下。

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;
 }
 }
 }
}

• 測試代碼一

$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;
 }
}

輸出：

[get_object_vars]
c =>




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

可見，當著三種方法用在類的外部時，結果是一樣的。get_object_vars()和foreach是獲取到的是對象的public non-static屬性，而通過反射的話則需要手動篩選出public non-static屬性。

• 測試代碼二

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

輸出

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

可見，get_object_vars()和foreach用在類內部時，private、protected、public的實例屬性都能獲取到。反射就不用說了，通過手動篩選，各種類型的屬性都能獲取到。