public static function times_occurred($string, $attributes)
 {
     $string_r = str_split($string);
     $times_matched = 0;
     foreach ($string_r as $char) {
         if (pts_strings::char_is_of_type($char, $attributes) == true) {
             $times_matched++;
         }
     }
     return $times_matched;
 }