String case inversion script

gistfile1.txt

  //Version 1, simple and performs about 40 times better than version 2
  $input = "i FORGOT CAPLOCK";
  $output = "";
  foreach(str_split($input) as $letter)
  {
      if(ctype_upper($letter))
      { $output .= strtolower($letter);}
      else { $output .= strtoupper($letter); }
  }
  echo $output;
  
  
  //Version 2,  not really a lot of point to it, it's slow and more complicated
  $text = str_split("i FORGOT CAPLOCK");
  foreach($text as $position => $input)
  {
      if(ctype_upper($input))
      { $text[$position] = strtolower($input);}
      else { $text[$position] = strtoupper($input); }
  }
  echo implode($text);