What do two colons mean in PHP?

I don't know what it's doing when we have this situation:

Foo::Bar

It looks like a path.

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That's (generally) for accessing a static method or property in a class. It's called the scope resolution operator, or Paamayim Nekudotayim (which leads to some amazingly confusing error messages!). See http://www.php.net/manual/en/language.oop5.paamayim-nekudotayim.php.

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The :: operator is the scope resolution operator. It is used to access class constants or static properties and methods, either from outside the class:

ClassName::CONSTANT_VALUE
ClassName::staticMethod()

Or within a class method to reference the same or a parent class using self and parent :

self::CONSTANT_VALUE
self::staticMethod()
parent::CONSTANT_VALUE
parent::staticMethod()

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范围解析运算符（：:)双冒号是允许访问类的静态 ， 常量和重写属性或方法的标记。

<?php
class A {

public static $B = '1'; # Static class variable.

const B = '2'; # Class constant.

public static function B() { # Static class function.
    return '3';
}

}

echo A::$B . A::B . A::B(); # Outputs: 123
?>

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