PHP获取对象属性的三种方法实例分析

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。

原文发布于微信公众号 - PHP技术大全(phpgod)

原文发表时间:2019-01-14

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