RE: [PHP] Preventing Identical Form Fields
| From: | Jon Haworth | Date: | Thu, 07 Feb 2002 17:27:03 +0000 |
| Subject: | RE: [PHP] Preventing Identical Form Fields | ||
| Groups: | php.general | ||
| Request: | Send a blank email to php-general+get-83877@lists.php.net to get a copy of this message | ||
> > With javascript onSubmit, but that ain't php, so with
> > if($form1==$form2){sendthembackwitherrors()}
> Thanks Chris, but I have about 10 different fields and want to make sure
> none of those are the same.
You could brute force it:
$ok = true;
if ($field1 == $field2 || $field1 == $field3 || .... ) $ok = false;
if ($field2 == $field3 || $field2 == $field4 || .... ) $ok = false;
if ($ok == false) sendThemBackWithErrors ();
Or you could use array_unique:
// Substitute $_GET if you're using GET instead of POST ;-)
if ($_POST != array_unique ($_POST)) sendThemBackWithErrors ();
I'm not sure if this second one would work - I don't know if you can do
straight comparisons of arrays - but the idea is to check that the submitted
array is the same as the array with all the duplicates removed (if it isn't,
there was a duplicate).
HTH
Jon