Get categories query not working in function.php

Question

I am trying to get the categories of my custom post type in functions.php But it not return any value, when i run this query in any theme file it work fine. Here is my code

function get_destinations(){
   $args = array(
    'type'                     => 'accomodation',
    'child_of'                 => 0,
    'parent'                   => '',
    'orderby'                  => 'name',
    'order'                    => 'ASC',
    'hide_empty'               => 1,
    'hierarchical'             => 1,
    'exclude'                  => '',
    'include'                  => '',
    'number'                   => '',
    'taxonomy'                 => 'facilitie',
    'pad_counts'               => false 

); 
 $categories = get_categories($args);$destinations = array();
              foreach ($categories as $cat) { 
                if($cat->cat_name != ''){
                    $destinations[$cat->cat_name] = $cat->cat_name;
                }
          }
return $destinations;
 }

I am using this code to add meta field, now i have to pass the category to select tag which is

$my_meta2->addSelect($prefix.'select_field_id',get_destinations(),array('name'=> 'Select Destination'));

The original code is like this, they pass the value in array.

$my_meta->addSelect($prefix.'select_field_id',array('selectkey1'=>'Select Value1','selectkey2'=>'Select Value2'),array('name'=> 'My select ', 'std'=> array('selectkey2')));

But not getting any value, Any idea where i am wrong. Thanks

Answer 1

You are using third party code to generate those meta boxes, and I am not familiar with how that code works. In fact, based on your question I am not even sure exactly where the code fails. Your description of the problem is inadequate. I can point out that your code is overly complex. It can be simplified considerably:

function get_destinations(){
  // Using a post type
  $args = array(
    'type'                     => 'book',
    'taxonomy'                 => 'genre',
  ); 
  $categories = get_terms($args); // changed to get_terms()

  if (!is_wp_error()) {
    $destinations = wp_list_pluck($categories,'cat_name');
    /* Convert to key=>value format
       I doubt this is actually necessary and can probably be omitted
    */
    $destinations = array_combine($destinations,$destinations);
    return $destinations;
  }
}
var_dump(get_destinations());

1. Remove the default arguments. You don't need to repeat those.
2. Use get_terms() as it returns a proper WP_Error object instead of only a part of one (at least on my install, which I may have broken. I do that periodically). At any rate, get_terms() makes more since as you are not retrieving "categories" but a custom taxonomy.
3. Verify that you have proper term results before trying to use them
4. Use wp_list_pluck() to simplify the foreach

As far as Core code, I only see three places where this can fail:

1. The post type is wrong
2. The taxonomy is wrong
3. There are not posts in the type/taxonomy

Answer 2

It Will work,

$cat_args = array(
                      'parent'  => 0,
                      'hide_empty' =>0,
                      'order'    => 'ASC',
                   );
    $categories = get_categories($cat_args);
    foreach($categories as $category){
       echo get_cat_name($category->term_id); 
    }

Answer 3

Check the Parameters section in the WordPress Codex for get_categories.

https://codex.wordpress.org/Function_Reference/get_categories#Parameters

The type parameter only accepts 2 values (post & link) and you are trying to use accomodation.

What you are probably wanting is get_terms.

https://codex.wordpress.org/Function_Reference/get_terms

So you will use this instead of get_categories.

$categories = get_terms('facilitie');

For what you are trying to do you probably don't need any $args array.

Then in your foreach you will just want to change $cat->cat_name to $cat->name.

Answer 4

function get_cat_val(){

    $taxonomies = array('YOUR_CAT_SLUG');

    $args = array(
        'order'             => 'ASC',
        'hide_empty'        => false,
        'hierarchical'      => true 
    ); 

    $terms = get_terms($taxonomies, $args);

    print_r($terms);

}

or

global $post;
$term_class = array();

$terms = get_the_terms( $post->ID, 'YOUR CAT SLUG' );

if ( $terms && ! is_wp_error( $terms ) ) {

    foreach ( $terms as $term ) {
        $term_class[] = $term->slug;
    }

}