<?php

function run () {
    $x = 4;

    $lambda1 = function () use ($x) {
        echo "$x\n";
    };

    $lambda2 = function () use (&$x) {
        echo "$x\n";
        $x++;
    };

    return array($lambda1, $lambda2);
}

list ($lambda1, $lambda2) = run();

$lambda1();
$lambda2();
$lambda1();
$lambda2();

echo "Done\n";
?>