php中的parent、self、static关键字

<?php

class BaseClass{
	public function test(){
		echo "BaseClass::test called\n";
	}
	public function test1(){
		echo "BaseClass::test1 called\n";
	}
}
class ChildClass extends BaseClass{
	const CONST_VALUE = "A constant value\n";
	private static $sValue = "static value\n";
	public function  test(){
		echo "ChildClass::test called\n";
		parent::test();
		//使用parent关键字可以访问父类中被子类重写的方法
		self::called();
		echo self::CONST_VALUE;
		echo self::$sValue;
		//使用self关键字可以访问自身的成员方法和常量成员
	}
	public function called(){
		echo "ChildClass::called() called\n";
	}
}
$obj = new ChildClass();
$obj->test();

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