time-permutations.php

<?php

$counter = 0;

for ($i = 0; $i <= 2359; $i++) {
	$n = str_pad($i, 4, '0', STR_PAD_LEFT);
	$ciphers = str_split($n);

	if ($ciphers[2] > 5) {
		continue ;
	}

	sort($ciphers);

	for ($j = 0; $j < 3; $j++) {
		if (($ciphers[$j + 1] - $ciphers[$j]) !== 1) { // not incremental ciphers -> skip entire number
			continue 2;
		}
	}

	echo $n, "\n";
	$counter++;
}

echo "\n", $counter, "\n";