PHP重载
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 style="background-color:rgb(255,255,255)">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 style="background-color:rgb(255,255,255)">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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