don't submit form if html present

Hi,
I have a form that's getting spammed with links.
I'd like to have the form not submit if links (or any other html is present)
Not sure where to start here. I know I can get a field's content, but not sure how to check if html is present.

Anyway, that would stop the spammers I think?

Thanx for your help

Mark

Hi Mark,

It's late now so only a very quick reply. Please see this FAQ for a partial answer. You can probably find a regular expression to apply that would pick up most HTML tags.

Bob

That did it - thanx Bob!

Posted my solution below (custom server side validation in "on submit" towards the top - the code in the faq has a minor error by the way:

if ( strpos($form->data['input_textarea_5'], $v) !== false ) { 

<?php
$ban_array = array(
  'http',
  'www',
  '.com'
);
$isvalid = true;
foreach ( $ban_array as $v ) {
  if ( strpos($form->data['input_textarea_5'], $v) != false ) {
    $form->validation_errors['input_textarea_5'] = 'Sorry, I do not allow links in this contact form.  Please remove any links and try again.';
    return false;
  }
}
?>

Hi Mark,

If the 'minor error' is the !== then it isn't. The PHP Manual says:

Warning
This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.

That's so that you can distinguish between 'false' and 'character position 0'.

Bob