Question

program to find out the combination of an element of each array gives a result 0

Answer 1

$words = array('red', 'blue', 'green');    $num = count($words);  //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 < $total; $j++) {         //Is bit $j set in $i?          if (pow(2, $j) & $i) echo $words[$j] . ' ';           }      echo '<br />';  }