PHP: create a static method

<?php
class StaticMethodTest {
    public static function doSomething() {
        echo 'Doing something...' . PHP_EOL;

        // Note: you cannot use "$this" from inside a static function, it will cause a fatal error
    }
}

// A static method can be called without an instance of the class using the double colon '::' operator:
StaticMethodTest::doSomething();