PHP获取对象属性的三种方法 |
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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。 |
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