stack_unwinding.php

<?php

function stackUnwind($n)
{
    if ($n > 0) {
        echo 'Parameter: ' . $n . PHP_EOL;
        stackUnwind($n - 1);
    }
    foreach (debug_backtrace() as $key => $val) {
        foreach ($val['args'] as $args) {
            echo $args;
        }
    }
    echo '  Stack unwindng: ' . $n . PHP_EOL;
}

stackUnwind(5);