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PHP面向对象之后期静态绑定功能介绍

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Release: 2016-06-06 20:04:00
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这篇文章主要介绍了PHP面向对象之后期静态绑定功能介绍,本文将对PHP后期静态绑定功能进行介绍,它主要用于解决在继承范围内引用静态调用的类,需要的朋友可以参考

本文将对PHP后期静态绑定功能进行介绍,它主要用于解决在继承范围内引用静态调用的类。

首先来看下面这个例子:

复制代码 代码如下:


class Person
{
 
    public static function status()
    {
        self::getStatus();
    }
 
    protected static function getStatus()
    {
        echo "Person is alive";
    }
 
}
 
class Deceased extends Person
{
 
    protected static function getStatus()
    {
        echo "Person is deceased";
    }
 
}
 
Deceased::status(); //Person is alive

很明显,结果不是我们预期的,,这是因为self::取决于定义时所在的类,而不是运行中的类。为了解决这个问题,你可能会在继承类中重写status()方法,更好的解决方案是PHP 5.3后添加了后期静态绑定的功能。

复制代码 代码如下:


class Person
{
 
    public static function status()
    {
        static::getStatus();
    }
 
    protected static function getStatus()
    {
        echo "Person is alive";
    }
 
}
 
class Deceased extends Person
{
 
    protected static function getStatus()
    {
        echo "Person is deceased";
    }
 
}
 
Deceased::status(); //Person is deceased

可见,static::不在指向当前所在的类,实际上,它是在运行中计算的,强制获取最终类的所有属性。

因此,建议,以后不要再使用self::,使用static::

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