PHP - Undefined Index Array Problem

I am taking my first course in PHP and I found some logic I am using to build a Tic-Tac-Toe game.  However, for some reason the 0th position of the array is being ignored.  Here is my code

<?php

$box = array('', '', '', '', '', '', '', '', '');
if (isset($_POST["submitbtn"])) {
  $box[0] = $_POST["box0"];
$box[1] = $_POST["box1"];
  $box[2] = $_POST["box2"];
  $box[3] = $_POST["box3"];
  $box[4] = $_POST["box4"];
  $box[5] = $_POST["box5"];
  $box[6] = $_POST["box6"];
  $box[7] = $_POST["box7"];
$box[8] = $_POST["box8"];
  echo "<pre>";
print_r($box);
}
 ?>
<html>
  <head>
    <title>Tic-Tac-Toe</title>
  </head>
  <body>
    <form name="TicTacToe" method="post" action="test2.php"
          <?php
                 for ($i=0; $i<=8; $i++) {
  printf('<input type ="text" name="box%s" value="%s">', $i, $box[$i]);
  if($i == 2 || $i == 5 || $i == 8){
    print('<br />');
  }
}
          print('<input type="submit" name="submitbtn" value="Submit">');
          ?>
          
    </form>
  </body>
</html>

Open in new window


Here is a screenshot of he error.
https://gyazo.com/500b6db6b2ff591c9d80b2f21aa03370

As you can see when I put 'a' into the first element of the array it is showing it in the second element.  I want to know how it can be corrected to be in the first element.

Please keep in mind I can't use techniques I haven't been taught so please keep it simple.

Thanks
sharingsunshineAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Guy Hengel [angelIII / a3]Billing EngineerCommented:
you don' t close the <form> tag properly...
0
Guy Hengel [angelIII / a3]Billing EngineerCommented:
<form name="TicTacToe" method="post" action="test2.php"
>
<?php
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
sharingsunshineAuthor Commented:
Looked all over for that problem.  Thanks for finding it so quickly
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
PHP

From novice to tech pro — start learning today.