PHP重载

WBOY
WBOYOriginal
2016-06-23 13:30:131174browse

PHP中的重载指的是动态的创建属性与方法,是通过魔术方法来实现的。属性的重载通过__set,__get,__isset,__unset来分别实现对不存在属性的赋值、读取、判断属性是否设置、销毁属性。

<strong>class Car {    private $ary = array();        public function __set($key, $val) {        $this->ary[$key] = $val;    }        public function __get($key) {        if (isset($this->ary[$key])) {            return $this->ary[$key];        }        return null;    }        public function __isset($key) {        if (isset($this->ary[$key])) {            return true;        }        return false;    }        public function __unset($key) {        unset($this->ary[$key]);    }}$car = new Car();$car->name = '汽车';  //name属性动态创建并赋值echo $car->name;</strong>

方法的重载通过__call来实现,当调用不存在的方法的时候,将会转为参数调用__call方法,当调用不存在的静态方法时会使用__callStatic重载。

<strong>class Car {    public $speed = 0;        public function __call($name, $args) {        if ($name == 'speedUp') {            $this->speed += 10;        }    }}$car = new Car();$car->speedUp(); //调用不存在的方法会使用重载echo $car->speed;</strong>

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