PHP Object-Oriented Programming - Special Practice DAY 4

<?php

class MagicTest{

	//__tostring会在把<strong>对象</strong>转换为string的时候自动调用
	public function __tostring(){
		return "This is the Class MagicTest. ";
	}

	// __invoke会在把<strong>对象</strong>当作一个方法调用的时候自动调用
	public function __invoke($x){
		echo "__invoke called with parameter ".$x."\n";
	}
}

$obj = new MagicTest();
echo $obj."\n";
$obj(5);

?>

<?php

class MagicTest{

	public function __tostring(){
		return "This is the Class MagicTest. ";
	}

	public function __invoke($x){
		echo "__invoke called with parameter ".$x."\n";
	}

	//方法的重载
	//这个方法的参数第一个就是调用的方法的名称，第二个参数是方法调用的参数组成的数组
	public function __call($name,$arguments){
		echo "Calling " . $name . " with parameters: ".
			implode(",", $arguments)."\n";

	}

	//<strong>静态方法</strong>的重载，注意这个方法需要设定为static
	public static function __callStatic($name,$arguments){
		echo "Static Calling " . $name . " with parameters: ".
			implode(",", $arguments)."\n";

	}
}

$obj = new MagicTest();

//runTest这两个方法的名称本来不能完全相同，但是通过魔术方法，可以调用了
$obj->runTest("para1","para2"); //没有声明这个runTest方法，因为有__call这个魔术方法，也可以被调用
MagicTest::runTest("para1","para2"); //没有声明这个runTest方法，因为有__callStatic这个魔术方法，也可以被调用

?>

<?php

class MagicTest{

	public function __tostring(){
		return "This is the Class MagicTest. ";
	}

	public function __invoke($x){
		echo "__invoke called with parameter ".$x."\n";
	}

	//方法的重载
	//这个方法的参数第一个就是调用的方法的名称，第二个参数是方法调用的参数组成的数组
	public function __call($name,$arguments){
		echo "Calling " . $name . "with parameters: ".
			implode(",", $arguments)."\n";

	}

	//<strong>静态方法</strong>的重载，注意这个方法需要设定为static
	public static function __callStatic($name,$arguments){
		echo "Static Calling " . $name . "with parameters: ".
			implode(",", $arguments)."\n";

	}

	//属性重载
	public function __get($name){
		return "Getting the property ".$name."\n";
	}

	public function __set($name, $value){
		echo "Setting the property ".$name." to value " . $value."\n";
	}

	public function __isset($name){
		echo "__isset invoked\n";
		return true;
	}

	public function __unset($name){
		echo "unsetting property ".$name."\n";
	}
}

$obj = new MagicTest();
echo $obj->className."\n"; //className未定义，但是通过魔术方法__get，这个方法好像被定义了一样
$obj->className='MagicClassX'; //通过魔术方法__get将className名称定义为MagicClassX
echo '$obj->name is set?'.isset($obj->className)."\n";
echo '$obj->name is empty?'.empty($obj->className)."\n";
unset($obj->className);
?>