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Notice (8): SplFileObject::fwrite() [<a href='https://secure.php.net/splfileobject.fwrite'>splfileobject.fwrite</a>]: Write of 5131 bytes failed with errno=28 No space left on device [CORE/src/Cache/Engine/FileEngine.php, line 141]

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PHP 中 __set()、__get()、__isset() 与 __unset() 用法

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 2014-12-21 19:39:06 转载来源: 网络整理/侵权必删

本文为大家讲解的是php中的PHP 中 __set()、__get()、__isset() 与 __unset() 的作用功能及用法，感兴趣的同学参考下。 概述 __set() 方法用于设置私有属性值

本文为大家讲解的是php中的PHP 中 __set()、__get()、__isset() 与 __unset() 的作用功能及用法，感兴趣的同学参考下。

概述

  • __set() 方法用于设置私有属性值。
  • __get() 方法用于获取私有属性值。
  • __isset() 方法用于检测私有属性值是否被设定。
  • __unset() 方法用于删除私有属性。

实际应用中，经常会把类的属性设置为私有（private），那么需要对属性进行访问时，就会变得麻烦。虽然可以将对属性的访问写成一个方法来实现，但 PHP 提供了一些特殊方法来方便此类操作。

__set()

__set() 方法用于设置私有属性值：

function __set($property_name, $value)
{ 
    $this->$property_name = $value; 
}

在类里面使用了 __set() 方法后，当使用 $p1->name = "张三"; 这样的方式去设置对象私有属性的值时，就会自动调用 __set() 方法来设置私有属性的值。

__get()

__get() 方法用于获取私有属性值：

function __set($property_name, $value)
{ 
    return isset($this->$property_name) ? $this->$property_name : null;
}

例子：

<?php
class Person {
    private $name;
    private $sex;
    private $age;

    //__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 />";
        return isset($this->$property_name) ? $this->$property_name : null;
    }
}

$p1=new Person();
//直接为私有属性赋值的操作， 会自动调用 __set() 方法进行赋值
$p1->name = "张三";
//直接获取私有属性的值， 会自动调用 __get() 方法，返回成员属性的值
echo "我的名字叫：".$p1->name;	
?>

运行该例子，输出：

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 在直接获取私有属性值的时候，自动调用了这个 __get() 方法 我的名字叫：张三

__isset()

__isset() 方法用于检测私有属性值是否被设定。

如果对象里面成员是公有的，可以直接使用 isset() 函数。如果是私有的成员属性，那就需要在类里面加上一个 __isset() 方法：

private function __isset($property_name)
{
    return isset($this->$property_name);
}

这样当在类外部使用 isset() 函数来测定对象里面的私有成员是否被设定时，就会自动调用 __isset() 方法来检测。

__unset()

__unset() 方法用于删除私有属性。

同 isset() 函数一样，unset() 函数只能删除对象的公有成员属性，当要删除对象内部的私有成员属性时，需要使用__unset() 方法：

private function __unset($property_name)
{
    unset($this->$property_name);
}

标签: PHP set get isset unset 用法


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