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PHP中双冒号::的用法,php冒号用法
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PHP中双冒号::的用法,php冒号用法

Jun 13, 2016 am 08:51 AM
php exist usage Baidu of Know

PHP中双冒号::的用法,php冒号用法

 前几天在百度知道里面看到有人问PHP中双冒号::的用法,当时给他的回答比较简洁因为手机打字不大方便!今天突然想起来,所以在这里总结一下我遇到的双冒号::在PHP中使用的情况!

 

class test { static public $a; static public function b() {} }


    如果要调用静态属性$a,如下

test::<span>$a</span>;
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注意,a前面需要带$符号,这一点与->符号不一样!

如果要调用静态方法b,如下

test::b();
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二,当调用自身类或者父类的属性或者方法时

首先建立一个父类

<span>class</span><span> test {
    </span><span>public</span> <span>function</span><span> b() {}
}</span>
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然后建立一个子类继承父类

<span>class</span> tests <span>extends</span><span> test {
    </span><span>public</span> <span>function</span><span> cs() {}
}</span>
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当我们需要调用父类的方法b时

parent::b();
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当我们需要调用自身的方法cs时,有两种方法
self::cs();
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<span>$this</span>->cs();
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    我遇到的大概就是以上两种情况,如果大家还遇到什么其他的情况,欢迎来王业楼的个人博客补充哈!
 

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