Hidden Category

Here you go

the category has to be additional to the selected categories.

for example: category 23, 56 and 117 are selected. category 1 has to be added.

So your form will have category dropdown or checkbox. But you want to add an additional category automatically after the post has been submitted?

Yes my form have checkbox for category.

“But you want to add an additional category automatically after the post has been submitted?” -> Yes i do 😉

array_push($_POST[‘Category’], “1″); ?

You should be trying like this:
[php]
function wpufe_add_category( $postarr ) {
if ( isset( $postarr[‘post_category’] ) ) {
array_push( $postarr[‘post_category’], 1);
}
}

add_filter( ‘wpuf_add_post_args’, ‘wpufe_add_category’ );
[/php]

Thx a lot.. but u forgot the return value 😉

function wpufe_add_category( $postarr ) {
if ( isset( $postarr[‘post_category’] ) ) {
array_push( $postarr[‘post_category’], 1);
}
return $postarr;
}

worked 😉