Add new post in existing categories using wp_insert_post

Question

I am trying to add a new post using the function wp_inser_post in one of my existing categories, I've created a new taxonomy named categorie and in that taxonomy i have a few categories, and I am not able to find a solution, the post is being added but no category is selected.

  $title =  $_POST['postTitle'];
  $description = $_POST['postContent'];  

  $new_post = array(
    'post_title' => esc_attr(strip_tags($title)),
    'post_content' => esc_attr(strip_tags($description)),
    'post_type' => 'proiecte',
    'post_status' => 'publish',
    'post_category' =>  array(17,16),
    'taxonomy'      => 'categorie'
  );

  $post_id = wp_insert_post($new_post);

Answer 1

post_category is only for Core Categories. Use tax_input instead:

$new_post = array( 
    'post_title' => esc_attr(strip_tags($title)),
    'post_content' => esc_attr(strip_tags($description)),
    'post_type' => 'proiecte',
    'post_status' => 'publish',
    'tax_input' => array(
        'categorie' => array(17,16)
    )
);
$post_id = wp_insert_post($new_post);

It may be clearer to other developers, and yourself in the future, if you use something other than categorie - perhaps projecte_category - just so it's clearer you're using a custom taxonomy and not misspelling Category.

Answer 2

You can use WordPress's wp_set_object_terms to do this. You can call this function after wp_insert_post call.

$post_id = wp_insert_post($new_post);

wp_set_object_terms( $post_id, 'term', 'categorie' );

You can pass set multiple terms by passing array of term. Ceck this for more.https://developer.wordpress.org/reference/functions/wp_set_object_terms/