preventing php from executing prematurely in html form script

Question

I have made a form with the php code right under the html form code in the same file. In the php code section, the page will echo "please fill in all the fields" if the user does not fill in and submit all the important field data. Whats bugging me is that the "please fill in all the fields" message displays BEFORE the user even clicks the submit button. I don't want anything to echo out until after the submit button is clicked, thanks.

thanks in advance.

It would help if you posted your code.

Kalessin
– Kalessin

2011-04-19 06:13:27 +00:00
Commented Apr 19, 2011 at 6:13 — Kalessin
– Kalessin, Commented Apr 19, 2011 at 6:13

Nanne · Accepted Answer · 2011-04-19 07:01:46Z

4

You could try this

if(isset($_POST['submit'])){
    echo "please fill in all the fields";
}

Where "submit" is the value of your submit button. And maybe add something like && $_POST['important_field'] == ""

You really should have posted some actual code by the way. That would make it a bit easier. Nevertheless I think you can fix it with this.

edited Apr 19, 2011 at 7:01

answered Apr 19, 2011 at 6:12

Nanne

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6 Comments

David Kuridža Over a year ago

It would be wiser to check if submit is set, otherwise an error will be shown.

Nanne Over a year ago

That is not true. IF it doesn't exist it 'returns' null.

kapa Over a year ago

Actually it will trigger a Notice. Lot of people just turn them off and don't care about them (laziness?). Using isset() would earn my upvote, since we are trying to promote best practices here.

David Kuridža Over a year ago

@Nanne, a notice will be triggered if a key does not exist in array. From the manual:

Attempting to access an array key which has not been defined is the same as accessing any other undefined variable: an E_NOTICE-level error message will be issued, and the result will be NULL.

.

Nanne Over a year ago

I consider a notice and an error different things, but you are right about it generating a notice. I'll add it.

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