compiler/examples/simple.php

<?php
function Ack($m, $n){
    if($m == 0) return $n+1;
    if($n == 0) return Ack($m-1, 1);
    return Ack($m - 1, Ack($m, ($n - 1)));
}


function main() {
    $n = 7;
    $r = Ack(3, $n);
    print "Ack(3,$n): $r\n";
}