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<?php $array1 = array('A', 'B'); $array2 = array('1', '2', '3'); $num = count($array2); //The total number of possible combinations $total = pow(2, $num); $temp = array(); //Loop through each possible combination for ($i = 0; $i < $total; $i++) { //For each combination check if each bit is set for ($j = 0; $j < $num; $j++) { //Is bit $j set in $i? if (pow(2, $j) & $i) $ff = $array2[$j] . ' '; } $temp[] = $ff; } print_r($temp);
based on 0XHJ2
Output for 5.0.4 - 7.1.0
Notice: Undefined variable: ff in /in/vIgnb on line 20 Array ( [0] => [1] => 1 [2] => 2 [3] => 2 [4] => 3 [5] => 3 [6] => 3 [7] => 3 )
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: ff in /in/vIgnb on line 20 Array ( [0] => [1] => 1 [2] => 2 [3] => 2 [4] => 3 [5] => 3 [6] => 3 [7] => 3 )