Category and subcategory

[webinuse]

I have set up everything for adding posts from frontend, choosing categories, adding images, files… everything. But I can not seem to find solution for my problem. User can post from form that automatically must have category called eg. “small service.” I have several “main” categories eg. “car”, “motor” and they all have this very subcategory. So when user chooses eg. “car” from dropdown, WordPress must automatically asign this very post to category “car” and its subcategory “small service”. Any help? Please. Thank you in advance.

$postTitleError = '';

if(isset($_POST['submitted']) && isset($_POST['post_nonce_field']) && 
 wp_verify_nonce($_POST['post_nonce_field'], 'post_nonce')) {

if(trim($_POST['postTitle']) === '') {
    $postTitleError = 'Molimo Vas da unesete naslov.';
    $hasError = true;
} else {
    $postTitle = trim($_POST['postTitle']);
}
$cat_ID = get_cat_ID( $_POST['newcat'] );

//If not create new category
if($cat_ID == 0) {
   $cat_name = array('cat_name' => $_POST['newcat']);
   wp_insert_category($cat_name);
 }

  //Get ID of newly created category
 $new_cat_ID = get_cat_ID($_POST['newcat']);

$post_information = array(
    'post_title' => esc_attr(strip_tags($_POST['postTitle'])),
    'post_content' => esc_attr(strip_tags($_POST['postContent'])),
    'post-type' => 'post',
    'post_status' => 'publish',
    'post_category' => array($new_cat_ID)

);

$post_id = wp_insert_post($post_information);

if($post_id)
{

    // Update Custom Meta
update_post_meta($post_id, 'vsip_custom_date', esc_attr(strip_tags($_POST['customMetaDate'])));
    update_post_meta($post_id, 'vsip_custom_brojilo', esc_attr(strip_tags($_POST['customMetaBrojilo'])));
    update_post_meta($post_id, 'vsip_custom_ulje', esc_attr(strip_tags($_POST['customMetaUlje'])));
        update_post_meta($post_id, 'vsip_custom_filter', esc_attr(strip_tags($_POST['customMetaFilter'])));
        update_post_meta($post_id, 'vsip_custom_permant', esc_attr(strip_tags($_POST['customMetaPermant'])));
        update_post_meta($post_id, 'vsip_custom_zamjena', esc_attr(strip_tags($_POST['customMetaZamjena'])));
update_post_meta($post_id, 'vsip_custom_file', esc_attr(strip_tags($_POST['customMetaFile'])));

    // Redirect
    wp_redirect( home_url() ); exit;
 }

 } 
  ?>
 <?php
 if( ! empty( $_FILES ) ) {
 foreach( $_FILES as $file ) {
   if( is_array( $file ) ) {
     $attachment_id = upload_user_file( $file );
   }
 }
 }
  ?>
    <?php get_header(); ?>
<!-- #primary BEGIN -->
 <div id="primary">
  <form action="" id="primaryPostForm" method="POST" enctype="multipart/form-data">
  <fieldset>
     <select id="cat" class="cat" name="newcat"  >
        <option value="0"><?php echo esc_attr(__('Izaberite vozilo')); ?></option>
        <?php
           $categories= get_categories(array('orderby ' => 'id' , 'order' => 'DESC' ,'hide_empty' => 0 , 'hierarchical' => true)); 
           foreach ($categories as $category) {
           $option = '<option value="'.$category->cat_name.', mali servis" broj="'.$category->category_count.'" val="'.$category->cat_name.'">';
           $option .= $category->cat_name; 
           $option .= '</option>';
           echo $option;
           }
           ?>
     </select>
  </fieldset>

[webinuse]

Why am I the one that always asks questions with no answers?!

[Shikkediel]

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