oop - Access of Non-Static Function of a Class in PHP

Question

Why is this legal in PHP?

<?php
class Foo {
    public function test() {
        echo "hello
";
    }
}

Foo::test();
?>

test() is a non-static function but I can access it without an instance.

Answer 1

It's legal, but generally frowned upon, until you reference $this in your statically called method which will throw a fatal error.