文章主要介紹了PHP獲取對(duì)象屬性的三種方法，結(jié)合實(shí)例形式分析了php面向?qū)ο蟪绦蛟O(shè)計(jì)中獲取對(duì)象屬性的常見操作技巧,需要的朋友可以參考下。

PHP獲取對(duì)象屬性的三種方法，具體如下：

今天查看yii源碼，發(fā)現(xiàn)yii\base\Model中的attribute()方法是通過反射獲取對(duì)象的public non-static屬性。記得以前看到的代碼都是用get_object_vars()這個(gè)函數(shù)獲取的，昨天查看php文檔，發(fā)現(xiàn)還可以用foreach遍歷對(duì)象屬性。于是寫個(gè)例子練習(xí)下。

1. class TestClass {
2.   private $a;
3.   protected $b;
4.   public $c;
5.   public $d;
6.   public static $e;
7.   private function funcA() {
8.   }
9.   protected function funcB() {
10.   }
11.   public function funcC() {
12.   }
13.   public function getPropertyMethodOne() {
14.     echo "[get_object_vars]", PHP_EOL;
15.     $vars = get_object_vars($this);
16.     foreach ($vars as $k => $v) {
17.       echo $k, ' => ', $v, PHP_EOL;
18.     }
19.   }
20.   public function getPropertyMethodTwo() {
21.     echo "[foreach object]", PHP_EOL;
22.     foreach ($this as $k => $v) {
23.       echo $k, ' => ', $v, PHP_EOL;
24.     }
25.   }
26.   public function getPropertyMethodThree() {
27.     echo "[reflection]", PHP_EOL;
28.     $class = new ReflectionClass($this);
29.     foreach ($class->getProperties(ReflectionProperty::IS_PUBLIC) as $property) {
30.       if (!$property->isStatic()) {
31.         echo $property->getName(), ' => ', $property->getValue($this), PHP_EOL;
32.       }
33.     }
34.   }
35. }

測(cè)試代碼一

1. $obj = new TestClass();
2. echo "[get_object_vars]", PHP_EOL;
3. $vars = get_object_vars($obj);
4. foreach ($vars as $k => $v) {
5.   echo $k, ' => ', $v, PHP_EOL;
6. }
7. echo "[foreach object]", PHP_EOL;
8. foreach ($obj as $k => $v) {
9.   echo $k, ' => ', $v, PHP_EOL;
10. }
11. echo "[reflection]", PHP_EOL;
12. $class = new ReflectionClass($obj);
13. foreach ($class->getProperties(ReflectionProperty::IS_PUBLIC) as $property) {
14.   if (!$property->isStatic()) {
15.     echo $property->getName(), ' => ', $property->getValue($obj), PHP_EOL;
16.   }
17. }

輸出：

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

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

測(cè)試代碼二

1. $obj = new TestClass();
2. $obj->getPropertyMethodOne();
3. $obj->getPropertyMethodTwo();
4. $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(nèi)部時(shí)，private、protected、public的實(shí)例屬性都能獲取到。反射就不用說了，通過手動(dòng)篩選，各種類型的屬性都能獲取到。