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run code in 150+ php & hhvm versions
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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($count > 2) { $array_merg = get_combinations(array_slice($arrays, 1)); } else { $array_merg = $arrays[1]; } print_r($arrays[0]); print_r($array_merg); $tmp = array(); foreach($arrays[0] as $arele1) { foreach($array_merg as $arele2) { if(is_array($arele2)) { $tmp[] = array_unshift($arele2,$arele1); } else { $tmp[] = array($arele1,$arele2); } } } return $tmp; } var_dump(get_combinations($a));
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 3 [1] => 4 ) Array ( [0] => 5 ) Array ( [0] => 1 [1] => 2 ) Array ( [0] => Array ( [0] => 3 [1] => 5 ) [1] => Array ( [0] => 4 [1] => 5 ) ) array(4) { [0]=> int(3) [1]=> int(3) [2]=> int(3) [3]=> int(3) }
Output for hhvm-3.10.0

Process exited with code 153.