What does double colon mean in php

藏色散人
Release: 2023-02-28 19:32:02
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What does double colon mean in php

What does the double colon mean in php?

First, when calling static properties and static methods

::and-> The function is the same, but the objects used are different! ::Refer to static methods or properties in the class, and no instantiation is required!

Create a class, and create a static property $a and a static method b, as follows:

class test {
    static public $a;
    static public function b() {}
}
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If you want to call the static property $a, as follows

test::$a;
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Note that a needs to be preceded by the $ symbol, which is different from the -> symbol!

If you want to call static method b, as follows

test::b();
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2, when calling attributes or methods of your own class or parent class

First create a Parent class

class test {
    public function b() {}
}
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Then create a subclass to inherit the parent class

class tests extends test {
    public function cs() {}
}
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When we need to call the parent class’s method b

parent::b();
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When we need to call our own method cs , there are two methods

$this->cs();
self::cs();
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