php.net

echo time(), ‘<br>‘;

function test()
{
    sleep(2);
    static $count = 0;
    // echo $count;
    $count++;
    echo $count;
    if ($count < 10) {
        test();
    }
    echo ‘<br>w-‘, time(), ‘-‘, $count;
    $count--;
}

test();
echo ‘<br>‘, time(), ‘<br>‘;

<?php
function test()
{
    static $count = 0;

    $count++;
    echo $count;
    if ($count < 10) {
        test();
    }
    $count--;
}

test();