Hi Larry, First of all, thanks for the book. It's being surprisingly easy to follow. I'm currently going through chapter 07 (arrays) and I was doing the excercise in "Transforming Between Strings and Array", I first created my list.html file and then on the list.php, this is what I wrote (HTML omitted): <?php //Get text from form $sorted_words = explode(' ',$_POST['words']); //Sort values sort($sorted_words); //Turn array back into a string $string_words = implode("<br />",$sorted_words); //Prints string print "<p>Alphabetized version of your text: <br />$string_words</p>"; ?> Everything working fine. However, the moment I add something else as separator: $sorted_words = explode(',',$_POST['words']); It prints out the phrase exactly as entered in the form, nothing seems to happen, no errors either. Where is the problem? PS: I've seen you are currently working on the 5th edition of "PHP and MySQL for Dynamic Web Sites". Any updates of how is it going? Planning to buy it as song as it gets published Many thanks in advance, Luis.