PHP入门指南：魔术方法

class MyClass {
    private $str;

    public function __construct($str) {
        $this->str = $str;
    }

    public function printStr() {
        echo $this->str;
    }
}

$obj = new MyClass('hello');
$obj->printStr(); //输出 hello

class MyClass {
    public function __destruct() {
        echo "Object destroyed.";
    }
}

$obj = new MyClass();
unset($obj); //销毁对象

class MyClass {
    public function __toString() {
        return "This is MyClass";
    }
}

$obj = new MyClass();
echo $obj; //输出 This is MyClass

class MyClass {
    private $name;

    public function __get($prop) {
        if($prop == 'name') {
            return $this->name;
        } else {
            return "Property $prop not found.";
        }
    }

    public function __set($prop, $value) {
        if($prop == 'name') {
            $this->name = $value;
        } else {
            echo "Property $prop not found.";
        }
    }
}

$obj = new MyClass();
$obj->name = 'Tom';
echo $obj->name; //输出 Tom
echo $obj->age; //输出 Property age not found.

class MyClass {
    public function __call($method, $args) {
        echo "Method $method not found.";
    }

    public static function __callStatic($method, $args) {
        echo "Static method $method not found.";
    }
}

$obj = new MyClass();
$obj->test(); //输出 Method test not found.
MyClass::demo(); //输出 Static method demo not found.