3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $array1 = array('A', 'B'); $array2 = array('1', '2', '3'); $num = count($array2); $comb = array(); //The total number of possible combinations $total = pow(2, $num); //Loop through each possible combination for ($i = 0; $i < $total; $i++) { $flag = ''; //For each combination check if each bit is set for ($j = 0; $j < $num; $j++) { //Is bit $j set in $i? if (pow(2, $j) & $i) $flag = $flag.''.$array2[$j]; } if(!empty($flag)) $comb[] = $flag; } print_r($comb); //foreahc
based on MHnYc
Output for 4.3.0 - 5.0.5, 5.1.1 - 7.1.0
Array ( [0] => 1 [1] => 2 [2] => 12 [3] => 3 [4] => 13 [5] => 23 [6] => 123 )
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/6vadJ on line 27
Process exited with code 255.