php - static::staticFunctionName()

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I know what
self::staticFunctionName() and
parent::staticFunctionName() are, and how they are different
from each other and from
$this->functionName.

But
what is static::staticFunctionName()?

Answer

It's the keyword used in PHP 5.3+ to invoke
late static bindings.
Read all about it in the manual: href="http://php.net/manual/en/language.oop5.late-static-bindings.php"
rel="noreferrer">http://php.net/manual/en/language.oop5.late-static-bindings.php

/>

In summary,
static::foo() works like a dynamic
self::foo().

class
            A {
 static function foo() {
 // This will be executed.

            }
 static function bar() {
 self::foo();

            }

}

class B extends A {
 static
            function foo() {
 // This will not be executed.
 // The above
            self::foo() refers to A::foo().

            }
}

B::bar();

static
solves this problem:

class A
            {
 static function foo() {
 // This is overridden in the child
            class.
 }
 static function bar() {

            static::foo();

 }
}

class B extends
            A {
 static function foo() {
 // This will be executed.

            // static::foo() is bound late.

            }
}


B::bar();

static
as a keyword for this behavior is kind of confusing, since it's all but.
:)