PHP can't find the submit button in my form. Undefined index

Question

SOLVED!

Seems that I only had to add isset to my check.

 if(isset($_POST['submitBtn'])) {

I am validating and processing some date that I want to get from my HTML form. I placed this form inside a $form variable, this way I can send people back to the register form. But somehow my PHP can't find my submit button ans gives me the error: undiefined index. Note that the PHP is in the same file as the form.

Because my form is rather long, I just post the submitbutton with the example:

 $form = "<form action='register.php' method='post'> <table> <tr> <td></td> <td><input type='submit' name='submitBtn' value='Register'></td> </tr> </table> </form>";

Part of my PHP:

 if($_POST['submitBtn']) { $firstname = strip_tags($_POST['firstname']); $lastname = strip_tags($_POST['lastname']); $username = strip_tags($_POST['username']);

Try if(isset($_POST['submitBtn'])) and close your conditional } - you also need to echo $form; somewhere. Plus, Undefined index... what? - That's rather b-r-o-a-d. — Funk Forty Niner
– Funk Forty Niner, Commented Sep 26, 2014 at 16:14
Where are your firstname, lastname and username form inputs? — Scott
– Scott, Commented Sep 26, 2014 at 16:15
My form is rather long, I shortened it up a bit. they are present. Let me add the isset, didn't noticed that! Bit this was the solution already! After a few hours of coding, I just stared blind to all the code. Thanks a lot! — Voltiac
– Voltiac, Commented Sep 26, 2014 at 16:17
Want me to put that comment of mine as an answer? Tell me which part of it worked. — Funk Forty Niner
– Funk Forty Niner, Commented Sep 26, 2014 at 16:19

Community · Accepted Answer · 2017-03-20 10:29:34Z

Putting in my comment as an answer, because that's how it's done on Stack in order to close a question and be marked as solved.

Instead of if($_POST['submitBtn']) you're not checking to see if it is set.

Do if(isset($_POST['submitBtn'])) instead.

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