Handy functions for working with references in PHP

ref.php

<?php

final class ref {
    static function &mk($x) { return $x; }
    static function get(&$x) { return $x; }
    static function set(&$x, $y) { $x = $y; }
    static function inc(&$x) { $x++; }
    static function dec(&$x) { $x--; }

    static function swap(&$x, &$y) {
        $_ = $x;
        $x = $y;
        $y = $_;
    }

    static function eq(&$x, &$y) {
        $_ = $x;
        $x = new \stdClass;
        $r = $x === $y;
        $x = $_;
        return $r;
    }
}