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;

Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.6, 7.2.30 - 7.2.33, 7.3.16, 7.3.18 - 7.3.20, 7.3.27, 7.3.30 - 7.3.33, 7.4.0 - 7.4.12, 7.4.16 - 7.4.20, 7.4.23 - 7.4.33, 8.0.1 - 8.0.2, 8.0.5 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7: 54810
Output for 5.4.1 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.2.29, 7.3.17, 7.3.21 - 7.3.26, 7.3.28 - 7.3.29, 7.4.13 - 7.4.15, 7.4.21 - 7.4.22, 8.0.0, 8.0.3: Process exited with code 137.

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139.96 ms | 403 KiB | 231 Q