3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function combinations(int $n, int $k):array { function combine(int $n, int $k, int $start = 0, array &$result = [], array &$all = []) { if ($k == 0) { $all[] = $result; return; } for ($i = $start; $i <= $n - $k; $i++) { $result[$k] = $i; combine($n, $k - 1, $i + 1, $result, $all); } } $res = []; $all = []; combine($n, $k, 0, $res, $all); return $all; } function may_add_combination_to_set(array $combination, array $sets) { foreach ($sets as $combinationInSet) { if (count(array_intersect($combinationInSet, $combination)) !== 1) { return false; } } return true; } $combinations = combinations(31, 6); $sets = []; foreach ($combinations as $combination) { if (may_add_combination_to_set($combination, $sets)) { $sets[] = $combination; } } count($sets);
Output for 7.2.0
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 20480 bytes) in /in/vq7d6 on line 14
Process exited with code 255.
Output for 7.0.0 - 7.1.10
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 4096 bytes) in /in/vq7d6 on line 14
Process exited with code 255.
Output for 5.3.21 - 5.6.28
Parse error: syntax error, unexpected ':', expecting '{' in /in/vq7d6 on line 4
Process exited with code 255.