WordPress add_action() Class static method callback


Example

class MyClass {
    static function my_init_method() {
        // do something here
    }
}

add_action( 'init', array( 'MyClass', 'my_init_method' ) );

Using a static method of a class to hook a set of instructions. With the init hook, the set of instructions will be executed right after wordpress has finished loading the necessary components.