PHP面向对象魔术方法之__call函数

<?php ???header(‘content-type:text/html;charset=utf-8‘); ???//__call魔术方法 ????class Monk{ ???????public $name; ???????protected $hobby; ???????public function __construct($name, $hobby){ ???????????$this->name = $name; ???????????$this->hobby = $hobby; ???????} ???????????????//输出该对象的信息 ???????public function showInfo(){ ???????????????????????echo ‘<br> 名字是 ‘ . $this->name; ???????????foreach($this->hobby as $hobby){ ???????????????echo ‘<br> 爱好有 ‘ . $hobby; ???????????} ???????} ???????//会做算术题, 保护的 ???????protected function getSum($num1, $num2){ ???????????????????????return $num1 + $num2; ???????} ???????//编写这个__call魔术方法， __call 魔术方法会接收到两个参数 ???????/* ???????????@param $method_name 就是函数名 ???????????@param $parameters 就是参数，类型是array ???????*/ ???????public function __call($method_name, $parameters){ ???????????// ???????????echo ‘<br> method_name = ‘ . $method_name;// ???????????echo ‘<br> $parameters <br>‘;// ???????????var_dump($parameters); ???????????????????????//判断 $this 中是否有 ?$method_name 函数，有就返回true,否则返回false ???????????if(method_exists($this, $method_name)){ ???????????????return $this->$method_name($parameters[0], $parameters[1]); ???????????}else{ ???????????????return ‘没有你要调用的函数‘; ???????????} ???????????????????} ????} ????$monk = new Monk(‘济公‘, array(‘no1‘=>‘腾云驾雾‘, ‘no2‘=>‘喝酒‘)); ????$monk->showInfo(); ????//当我们直接调用 protected 方法时，就会触发 __call 魔术方法 ????echo ‘<br> 结果是‘ . $monk->getSum(100, 200);

<?php ???header(‘content-type:text/html;charset=utf-8‘); ???/* ???练习题: 请编写一个Cat类(有 年龄, 名字 二个属性)，要求二个属性全部都是public。Cat类有一个 方法 jiSuan($n1, $n2, $oper) 可以计算+ - * / 是私有的.在类外部，$对象名->play(‘jiSuan‘, $n1, $n2, $oper) 得到结果，注意play这个方法，在类中没有定义.要求 play 是固定的，如果没有按规则写，则给出相应的错误提示! ???*/ ???class Cat{ ???????public $name; ???????public $age; ???????public function __construct($name, $age){ ???????????$this->name = $name; ???????????$this->age = $age; ???????} ???????????????private function jiSuan($n1, $n2, $oper){ ???????????????????????$res = 0; ???????????switch($oper){ ???????????????case ‘+‘: ???????????????????$res = $n1 + $n2; ???????????????????break; ???????????????case ‘-‘: ???????????????????$res = $n1 - $n2; ???????????????????break; ???????????????case ‘*‘: ???????????????????$res = $n1 * $n2; ???????????????????break; ???????????????case ‘/‘: ???????????????????$res = $n1 / $n2; ???????????????????break; ???????????????default : ???????????????????echo ‘你输入的运算符号不对‘; ???????????} ???????????return $res; ???????} ???????//编写一个__call 魔术方法 ???????public function __call($method_name, $parameters){ ???????????????????????//先判断是否通过 ‘play‘ 调用 ???????????if($method_name == ‘play‘){ ???????????????//继续 ???????????????if( method_exists($this, $parameters[0]) ){ ???????????????????//继续 ???????????????????return $this->$parameters[0]($parameters[1], $parameters[2], $parameters[3]); ???????????????}else{ ???????????????????return ‘ 你调用的 ‘ . $parameters[0] . ‘ 不存在‘; ???????????????} ???????????}else{ ???????????????return ‘ 你调用的方式有问题 ‘; ???????????} ???????} ???} ???$cat = new Cat(‘小花猫‘, 3); ???echo ‘<br> 运算的结果是 ‘ . $cat->play(‘jiSuan‘, 10, 20, ‘-‘);