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run code in 150+ php & hhvm versions
Bugs & Features
<?php function generate_comb($pos, &$res) { global $comb; print_r('{' . $res . '}'); echo "\n"; if ($res != '') { $res = $res . ','; } for ($i = $pos + 1; $i < count($comb); $i++) { $var = $res . $comb[$i]; generate_comb($i, $var); } } $comb = array(1, 2, 3, 4, 5); $pos = -1; $res = ''; generate_comb($pos, $res);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
{} {1} {1,2} {1,2,3} {1,2,3,4} {1,2,3,4,5} {1,2,3,5} {1,2,4} {1,2,4,5} {1,2,5} {1,3} {1,3,4} {1,3,4,5} {1,3,5} {1,4} {1,4,5} {1,5} {2} {2,3} {2,3,4} {2,3,4,5} {2,3,5} {2,4} {2,4,5} {2,5} {3} {3,4} {3,4,5} {3,5} {4} {4,5} {5}