Code for checking if user registration fields have been filled

[JennyKhoo]

Hi

I have removed most of the user registration fields and now want to check if fields not displayed are being filled in by spambots. In particular, I want to check if the 'homepage' field has been filled in and then discontinue the registration procedure.

I have tried the following but it is not working -

if ($_POST['homepage'] > ''){
exit();
}

I have put this in register.php after this code >

// ############################### start add member ###############################
if ($_POST['do'] == 'addmember')
{
$vbulletin->input->clean_array_gpc('p', array(
'options' => TYPE_ARRAY_BOOL,
'username' => TYPE_STR,
'email' => TYPE_STR,
'emailconfirm' => TYPE_STR,
'parentemail' => TYPE_STR,
'password' => TYPE_STR,
'password_md5' => TYPE_STR,
'passwordconfirm' => TYPE_STR,
'passwordconfirm_md5' => TYPE_STR,
'referrername' => TYPE_NOHTML,
'imagestamp' => TYPE_STR,
'imagehash' => TYPE_STR,
'coppauser' => TYPE_BOOL,
'day' => TYPE_UINT,
'month' => TYPE_UINT,
'year' => TYPE_UINT,
'timezoneoffset' => TYPE_NUM,
'dst' => TYPE_UINT,
'userfield' => TYPE_ARRAY,
'showbirthday' => TYPE_UINT,
));

Can anyone suggest some simple code to check whether 'homepage' has been entered and where to put this code in register.php?

Thanks.