Get an array of category ids in wordpress?

2 comments

1. Based on the documentation it returns:

   $category->term_id
   $category->name
   $category->slug
   $category->term_group
   $category->term_taxonomy_id
   $category->taxonomy
   $category->description
   $category->parent
   $category->count
   $category->cat_ID
   $category->category_count
   $category->category_description
   $category->cat_name
   $category->category_nicename
   $category->category_parent
   

   So:

   $output_categories = array();
   $categories=get_categories($args);
     foreach($categories as $category) { 
        $output_categories[$category->cat_ID] = $category->name;
   }
   

   Then $output_categories is exactly what you need.

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2. When you use get_terms:

   <?php
   
   $categories_ids = get_terms(
       array( 'category' ), // Taxonomies
       array( 'fields' => 'ids' ) // Fields
   );
   
   ?>
   

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