3v4l.org

run code in 300+ PHP versions simultaneously

@ 2015-04-07T08:57:40Z

<?php

$in = 8;
$count = 0;

function trace($x, $y, $z, $steps) {
        global $count;
        if ($steps == 0) {
                if ($x == 0 && $y == 0 && $z == 0) {
                        $count++;
                }
                return;
        }
        for($i = $x-1; $i <= $x+1; $i++) {
                for($j = $y-1; $j <= $y+1; $j++) {
                        for($k = $z-1; $k <= $z+1; $k++) {
                                if (
                                        array_sum(array($i, $j, $k)) !== 0
                                        || ($i == $x && $j == $y && $k == $z)
                                ) {
                                        continue;
                                }
                                trace($i, $j, $k, $steps-1);
                        }
                }
        }
}

trace(0, 0, 0, $in);
echo $count;

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array_sum: documentation ( source)

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