PHP魔术方法__unset()
2018-09-16 23:00 By
"Powerless"
3116
0
1
未定义或无权限访问的属性上调用unset()方法时会触发__unset()方法。
示例代码如下：
<?php
class Person
{
public $sex;
private $name;
private $age;
public function __construct($name="", $age=25, $sex='Male')
{
$this->name = $name;
$this->age = $age;
$this->sex = $sex;
}
/**
* @param $content
*
* @return bool
*/
public function __unset($content) {
echo "It is called automatically when we use the unset() method outside the class.<br>";
echo isset($this->$content);
}
}
$person = new Person("John", 25); // 赋初始值
unset($person->sex),"<br>";
unset($person->name),"<br>";
unset($person->age),"<br>";
输出结果如下：
It is called automatically when we use the unset() method outside the class. 1 It is called automatically when we use the unset() method outside the class. 1
View in WeChat
Others Discussion
-
HTTP头中隐藏PHP版本号 Posted on 2021-01-11 16:38
-
Composer 异常 [ErrorException] Posted on 2019-11-25 17:55
-
TCP协议的特性 Posted on 2019-04-26 16:46
-
能创建多少个 TCP 连接？ Posted on 2021-08-02 16:00
-
PHP练习-移动数组内的0到最后并保持其他元素顺序不变 Posted on 2020-08-14 20:32
-
Mysql联合索引的最左前缀匹配原则 Posted on 2018-08-25 15:00
-
PHP没你想的那么差 Posted on 2021-12-17 15:40
-
快速了解Kafka Posted on 2021-03-25 14:20
评 论