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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;
- }
- }
- }
- }
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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;
- }
- }
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输出:
- [get_object_vars]
- c =>
- d =>
- [foreach object]
- c =>
- d =>
- [reflection]
- c =>
- d =>
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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();
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输出
- [get_object_vars]
- a =>
- b =>
- c =>
- d =>
- [foreach object]
- a =>
- b =>
- c =>
- d =>
- [reflection]
- c =>
- d =>
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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。
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