test_globals_arrayaccess

<?php
    class Globals implements ArrayAccess {
        public function offsetGet($key) {
            return 'Yupp!';
        }
        public function offsetSet($key, $value) {}
        public function offsetUnset($key) {}
        public function offsetExists($key) {}
    }

    $GLOBALS = new Globals();

    function test_globals() {
        echo $GLOBALS['nonexistent value']; // echoes "Yupp!"
    }

    test_globals();