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<?php
function get_all_category_ids() {
    if ( ! $cat_ids = wp_cache_get( 'all_category_ids', 'category' ) ) {
        $cat_ids = get_terms( 'category', array('fields' => 'ids', 'get' => 'all') );
        wp_cache_add( 'all_category_ids', $cat_ids, 'category' );
    }

    return $cat_ids;
}
?>

• Function Reference/get all category ids « WordPress Codex
  Description. Retrieves all category IDs. Usage. <?php get_all_category_ids() ?> Parameters. None. Return Values. (array): A list of all of the category IDs.
  codex.wordpress.org
• WordPress › Support » Tags — get_all_category_ids
  Forums. Username or Email Address Password (forgot?) Register · WordPress › Support » get_all_category_ids. Tag: get_all_category_ids Add New » ...
  wordpress.org
• get_all_category_ids() WordPress function reference, arguments ...
  Retrieves all category IDs. Signature. get_all_category_ids(). Return. (object) List of all of the category IDs. Source. function get_all_category_ids() { if ( ! $cat_ids ...
  queryposts.com
• get_all_category_ids (WordPress Function) - WPSeek.com
  WordPress lookup for get_all_category_ids, a WordPress Function. wpseek.com is a WordPress-centric search tool for developers and theme authors.
  wpseek.com

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