$str = new TokenizedString($tss);
while ($str->next()) {
 //Identify strings


   if ($str->identifyCharacter() == Tokenizer::QUOTE) {
     //It's a string...
     $extractedString = $str->extractString();
     $tokens->add(['type' => Tokenizer::STRING, $extractedString]);
     
      //now move the pointer on to the end of the string which was extracted (the pointer will now be at the closing quote)
     $str->move(strlen($extractedString));

    //When the loop iterates next it will move on to the character following the identified string
    }
   else if (/* it's a comment, or a literal, or a bracket*/) {
    //handle the next type
   }
}