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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