Usage of double colon:: in PHP, php colon usage_PHP tutorial

Usage of double colon:: in PHP, usage of colon in php

A few days ago, I saw someone on Baidu Zhizhi asking about the usage of double colon:: in PHP, and I gave it to him at that time The answer is relatively concise because it is not convenient to type on a mobile phone! It suddenly occurred to me today, so here is a summary of the situations I encountered using double colon:: in PHP!

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

If you want to call the static property $a, as follows

test::<span>$a</span>;

Note that a needs to be preceded by a $ sign, which is different from the -> sign!

If you want to call static method b, as follows

test::b();

2. When calling attributes or methods of your own class or parent class

First create a parent class

<span>class</span><span> test {
    </span><span>public</span> <span>function</span><span> b() {}
}</span>

Then create a subclass that inherits the parent class

<span>class</span> tests <span>extends</span><span> test {
    </span><span>public</span> <span>function</span><span> cs() {}
}</span>

When we need to call method b of the parent class

parent::b();

When we need to call our own method cs, there are two methods

self::cs();

<span>$this</span>->cs();

What I encountered are probably the above two situations. If you encounter any other situations, you are welcome to come to Wang Yelou’s personal blog to add them!

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