<?php
// Correct.
function Foo() {}
$a = function() {};
abstract class Foo {
        public function PublicFunction() {}
        private function PrivateFunction() {}
        protected function ProtectedFunction() {}
        static function StaticFunction() {}
        abstract protected function AbstractProtectedFunction();
        final static public function FinalStaticPublicFunction() {}
}
// Incorrect.
Function Bar() {}
$a = FUNCTION() {};
abstract class Bar {
        Public function PublicFunction() {}
        Private function PrivateFunction() {}
        Protected function ProtectedFunction() {}
        Static function StaticFunction() {}
        ABSTRACT proTECted FUNCTION AbstractProtectedFunction();
        Final STATIC PUBLIC Function FinalStaticPublicFunction() {}
}