What does :: mean in PHP?

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In PHP, the double colon (::) operator is a range parsing operator. Also scoped operator. It is a static reference to a method in the class and can access static, const, and overridden properties and methods in the class.

When php calls internal static members of a class, or calls between classes, two colons (::) must be used.

Note: The "::" symbol can be considered similar to the "." in C language, and it is more like the :: class range operator in C (Perl).

Example:

class A{ static $count = 0; static function haha(){ // } function diaoyoug(){ self::haha(); self::$count; } } a.b.c; /* C语言中的 */ a::b::c(); // C++ 中的函数 $a::b::c; # Perl 5中的标量

If the double colon (::) operator is used outside the class definition, it must be called using the class name. In PHP 5.3.0, you can use variables instead of class names.

Example: Using the double colon (::) operator outside the class definition

Output:

Fruit Color Red

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1. Introduction to the meaning of the double colon::range parsing operator in php
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