<?php

class test {

    static function bar() {

        var_dump(isset($_SERVER));
        var_dump(empty($_SERVER));
        var_dump(gettype($_SERVER));
        var_dump(count($_SERVER));

        var_dump($_SERVER['PHP_SELF']);
        unset($_SERVER['PHP_SELF']);
        var_dump($_SERVER['PHP_SELF']);

        unset($_SERVER);
        var_dump($_SERVER);

    }
}

test::bar();

echo "Done\n";
?>