function randomColor() {       $str = '#';       for($i = 0 ; $i < 6 ; $i++) {           $randNum = rand(0 , 15);           switch ($randNum) {               case 10: $randNum = 'A'; break;               case 11: $randNum = 'B'; break;               case 12: $randNum = 'C'; break;               case 13: $randNum = 'D'; break;               case 14: $randNum = 'E'; break;               case 15: $randNum = 'F'; break;           }           $str .= $randNum;       }       return $str;   }   $color = randomColor();