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run code in 150+ php & hhvm versions
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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, $num); //Loop through each possible combination for ($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 = $ff.''.$array2[$j]; } $temp[]=$ff; } print_r($temp);
based on Yt7Lc
Output for 5.0.4 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: ff in /in/9nrmH on line 19 Notice: Undefined variable: ff in /in/9nrmH on line 17 Array ( [0] => [1] => 1 [2] => 12 [3] => 1212 [4] => 12123 [5] => 1212313 [6] => 121231323 [7] => 121231323123 )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: ff in /in/9nrmH on line 19 Notice: Undefined variable: ff in /in/9nrmH on line 17 Array ( [0] => [1] => 1 [2] => 12 [3] => 1212 [4] => 12123 [5] => 1212313 [6] => 121231323 [7] => 121231323123 )