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PHP special methods __set(), __get()_PHP tutorial

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2016-07-12 09:04:23902browse

PHP special methods __set(), __get()

 <?php
    header("Content-type: text/html; charset=utf-8"); 
    class person{
        //成员属性
        private $name;
        private $age = 20;
        //成员方法
        function username($name){
            return $this->name=$name;
        }
        //__set()方法用来设置私有属性
        function __set($property_name, $value) { 
        echo "在直接设置私有属性值的时候,自动调用了这个 __set() 方法为私有属性赋值<br />";
        $this->$property_name = $value; 
        }
 
        //__get()方法用来获取私有属性
        function __get($property_name) {  
        echo "在直接获取私有属性值的时候,自动调用了这个 __get() 方法<br />";
        }
    }
    $obj= new person();
    echo $obj->username("张三");
    echo "<hr/>";
    $obj->name = "李四";//在直接设置私有属性值的时候,自动调用了这个 __set() 方法为私有属性赋值
    echo "<hr/>";
    echo $obj->age;//在直接获取私有属性值的时候,自动调用了这个 __get() 方法,不设置get特殊方法就会报下面的错
    //echo $obj->age;//当成员属性或者方法前有private修饰,不能在类外访问。否则报错如下
    /*
     Fatal error: Cannot access private property person::$age in D:\wamp\www\ajax\index.php on line 23
    */
?>

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1073354.htmlTechArticlePHP special methods __set(), __get() ?php header(Content-type: text/html; charset =utf-8); class person{ //Member attribute private $name; private $age = 20; //Member method function usern...
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