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php延迟静态绑定实例分析,延迟静态实例分析

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Release: 2016-06-13 09:15:13
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php延迟静态绑定实例分析,延迟静态实例分析

本文实例讲述了php延迟静态绑定的方法。分享给大家供大家参考。具体分析如下:

php延迟静态绑定:指类的self,不是以定义时为准,而是以计算时的运行结果为准。先看一个实例

<&#63;php
header("content-type:text/html;charset=utf-8");
class Human{
 public static function hei(){
 echo "我是父类的hei()方法";
 }
 public function say(){//如果子类调用父类的say()方法,则
 self::hei();//这里调用的是父类的hei()方法
 static::hei();
//这里调用子类的hei()方法,如果子类不存在hei()方法,则调用父类的
 }
}
class Stu extends Human{
 public static function hei(){
 echo "我是子类的hei()方法";
 }
}

$stu = new Stu();
$stu->say();
&#63;>

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说明:

(1)子类实例化对象 $stu 调用say方法时,是在父类Human内运行的,所以,say()里的self::hei()是调用父类的hei()方法。

(2)static::方法名():使用static关键词,则首先是在子类里查找该方法;如果找不到,则到父类中查找。

希望本文所述对大家的php程序设计有所帮助。

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