What do two colons mean in php?

Reference methods of static methods and static properties in PHP classes

Static properties of the class and direct reference to the method. In this case, you can call it directly using "::" without instantiating the class.

When calling static properties and static methods (Recommended learning: PHP programming from entry to proficiency)

::With- >The function is the same, but the objects used are different! ::Refer to static methods or properties in the class, and do not need to be instantiated!

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() {}

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

test::$a;

Note, 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();

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

First create a parent class

class test {
    public function b() {}
}

When we need to call the parent class’s method b

parent::b();

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

$this->cs();

self::cs();

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