__unset()魔术方法 删除私有属性
unset()对共有属性进行删除 可通过__unset()魔术方法对私有属性进行操作
当在类外部执行unset()函数时,自动执行类内__unset()魔术方法
class hdw { private $name; private $age; private $money; //员工工资 public $c; function __construct($name, $age = ‘‘, $money) { $this->name = $name; $this->age = $age; $this->money = $money; } function __isset($var) { $array = array ("name", "age" ); if (in_array ( $var, $array )) { echo $var . "属性存在,他的值是:" . $this->$var; } elseif (in_array ( $var, array_keys ( get_object_vars ( $this ) ) )) { echo "属性不允许外部检查"; return; } else { echo "属性不存在"; } } function __unset($c) { if ($c == ‘age‘) { unset ( $this->$c ); echo "删除属性{$c}成功!"; } else { echo "不允许删除属性{$c}"; } } function get_money() { echo $this->money; } } $lisi = new hdw ( "李四", 22, 5500 ); //isset ( $lisi->money2222 ) ; //echo isset($_GET[‘page‘])?$_GET[‘page‘]:1; unset ( $lisi->name ); //echo $lisi->get_money();
时间: 2024-11-09 03:23:10