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<?php $a = array(array(1, 2), array(3, 4), array(5)); function get_combinations($arrays) { $result = array(array()); $count = count($arrays); if(is_array($arrays[0])) { $first_array = $arrays[0]; if($count > 2) { $array_merg = get_combinations(array_slice($arrays, 1)); } else { $array_merg = $arrays[1]; } $tmp = array(); foreach($first_array as $arele1) { foreach($array_merg as $arele2) { if(is_array($arele2)) { $tmp[] = array_merge(array($arele1),$arele2); } else { $tmp[] = array($arele1,$arele2); } } } return $tmp; } else { return $arrays; } } var_dump(get_combinations($a));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> array(3) { [0]=> int(1) [1]=> int(3) [2]=> int(5) } [1]=> array(3) { [0]=> int(1) [1]=> int(4) [2]=> int(5) } [2]=> array(3) { [0]=> int(2) [1]=> int(3) [2]=> int(5) } [3]=> array(3) { [0]=> int(2) [1]=> int(4) [2]=> int(5) } }