PHP中类的延迟绑定详解编程语言

<?php 
	header("content-type:text/html;charset=utf-8"); 
	class a{ 
		public function call(){ 
			echo "父类的".__CLASS__; 
		} 
		public static function say(){ 
			self::call();//直接在父类中调用call方法 
		} 
		public static function say1(){ 
			static:: call();//延迟绑定到b的call方法 
		} 
 
	} 
	class b extends a{ 
		public function call(){ 
			echo "子类的".__CLASS__; 
		} 
	} 
 
	b::say();//父类的a 
	b::say1();//子类的b