Passing a variable to register_taxonomy()

Question

I'm trying to create multiple taxonomies. As follows.....

$taxonomies = $wpdb->get_results( "SELECT * FROM $table_name" );
foreach ($taxonomies as $taxonomy) {
  //stuff that defines the taxonomy
register_taxonomy( $taxonomy->singular_name, 'book', $tagArgs );
}

It appears that WP dislikes regestering the taxonomy with $taxonomy->singular_name. Xdebug givies me the following error.

Notice: Trying to get property of non-object in /home/wpplugin/public_html/wp-includes/link-template.php on line 898

I've tried several diffent things. Converting the object to an array and feeding that to register_taxonomy(), I've tride casting $taxonomy->singular_name as a string and a few other random guessees that yeilded the same result. The only thing that works is putting a quoted string in place of $taxonomy->singular_name which won't fit my needs.

Does any one have any ideas on this?? Thanks Greg

Full code here.....

add_action( 'init', 'create_book_taxonomies', 0 );function create_book_taxonomies() {
global $wpdb;
$table_name = $wpdb->prefix . 'wlc_custom_taxonomy';
$taxonomies = $wpdb->get_results( "SELECT * FROM $table_name" );
foreach ($taxonomies as $taxonomy) {
    $enterMeOnce = $taxonomy->singular_name;
    $book = $taxonomy->singular_name;

    if($taxonomy->singular_name != 'singular-name'){ //exclude the default table row
        $resLabels = array(
                'name'               => _x( $enterMeOnce , 'Post Type General Name' ),
                'singular_name'      => _x( $enterMeOnce , 'Post Type Singular Name' ),
                'menu_name'          => __( $enterMeOnce  ),
                'name_admin_bar'     => __( $enterMeOnce  ),
                'all_items'          => __( $enterMeOnce  ),
                'add_new_item'       => __( 'Add New ' . $enterMeOnce  ),
                'edit_item'          => __( 'Edit ' . $enterMeOnce  ),
                'new_item'           => __( 'New ' . $enterMeOnce  ),
                'view_item'          => __( 'View ' . $enterMeOnce  ),
                'search_item'        => __( 'Search ' . $enterMeOnce  ),
                'not_found'          => __( 'No '.$enterMeOnce .' found' ),
                'not_found_in_trash' => __( 'No '.$enterMeOnce .' found in trash' ),
                'description'         => __( $enterMeOnce .' are special posts that are showcased on the '.$enterMeOnce .' page.' ),
            );
        $resArgs = array(
                'labels' => $resLabels,

                'public'              => true,
                'exclude_from_search' => false,
                'publcly_queryable'   => true,
                'show_ui'             => true,
                'show_in_menu'        => true,
                'show_in_nav_menus'   => true,
                'show_in_admin_bar'   => true,
                'menu_position'       => 5,
                'menu_icon'           => 'dashicons-lightbulb',
                'capability_type'     => 'post',
                'meta_box_cb'         => true,
                'show_admin_column'   => true,
                'hierarchical'        => true,
                'has_archive'         => true,
                //'rewrite'           => true,
                /*'capabilities'        => array(
                    'manage_terms' => 'manage_resource',
                    'edit_terms'   => 'manage_categories',
                    'delete_terms' => 'manage_categories',
                    'assign_terms' => 'edit_posts'
                ),*/
                'supports'           => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'post_format' )
            );

    register_post_type( $book , $resArgs );

        $labels = array(
                'name'                       => _x( $taxonomy->name . ' Categories', 'Taxonomy General Name', 'text_domain' ),
                'singular_name'              => _x( $taxonomy->name . ' Category', 'Taxonomy Singular Name', 'text_domain' ),
                'menu_name'                  => __( $taxonomy->name . ' Categories', 'text_domain' ),
                'all_items'                  => __( 'All Categories', 'text_domain' ),
                'parent_item'                => __( 'Parent Category', 'text_domain' ),
                'parent_item_colon'          => __( 'Parent Category:', 'text_domain' ),
                'new_item_name'              => __( 'New Resource Category', 'text_domain' ),
                'add_new_item'               => __( 'Add New Resource Category', 'text_domain' ),
                'edit_item'                  => __( 'Edit Category', 'text_domain' ),
                'update_item'                => __( 'Update Category', 'text_domain' ),
                'separate_items_with_commas' => __( 'Separate resource cat names with commas', 'text_domain' ),
                'search_items'               => __( 'Search Resource Categories', 'text_domain' ),
                'add_or_remove_items'        => __( 'Add or remove resource categories', 'text_domain' ),
                'choose_from_most_used'      => __( 'Choose from the most used Categories', 'text_domain' ),
                'not_found'                  => __( 'Resource Category Not Found', 'text_domain' ),
                'slug'                       => __( $taxonomy->name . 'category' )
            );

            $args = array(
                'labels'                     => $labels,
                'hierarchical'               => true,
                'public'                     => true,
                'has_archive'                => true,
                'show_ui'                    => true,
                'show_admin_column'          => true,
                'show_in_nav_menus'          => true,
                'show_tagcloud'              => false,
                'rewrite'                    => true,
            );


            register_taxonomy( $taxonomy->singular_name, array( $book ), $args );

            $tagLabels = array(
                'name'                       => _x( 'Writers', 'taxonomy general name' ),
                'singular_name'              => _x( 'Writer', 'taxonomy singular name' ),
                'search_items'               => __( 'Search Writers' ),
                'popular_items'              => __( 'Popular Writers' ),
                'all_items'                  => __( 'All Writers' ),
                'parent_item'                => null,
                'parent_item_colon'          => null,
                'edit_item'                  => __( 'Edit Writer' ),
                'update_item'                => __( 'Update Writer' ),
                'add_new_item'               => __( 'Add New Writer' ),
                'new_item_name'              => __( 'New Writer Name' ),
                'separate_items_with_commas' => __( 'Separate writers with commas' ),
                'add_or_remove_items'        => __( 'Add or remove writers' ),
                'choose_from_most_used'      => __( 'Choose from the most used writers' ),
                'not_found'                  => __( 'No writers found.' ),
                'menu_name'                  => __( $taxonomy->name . ' Tags' ),
            );

            $tagArgs = array(
                'hierarchical'          => false,
                'labels'                => $tagLabels,
                'show_ui'               => true,
                'show_admin_column'     => true,
                'update_count_callback' => '_update_post_term_count',
                'query_var'             => true,
                'rewrite'               => array( 'slug' => 'writer' ),
            );

            register_taxonomy( $taxonomy->singular_name, $book, $tagArgs );


    }
}
}

Answer 1

It turns out the issue here is the foreach statement. I changed the loop from

foreach ($taxonomies as $taxonomy) {

to

for ($counter=0; $counter < sizeof($taxonomy); $counter++) { 

as well as all relivant itirators so....

register_taxonomy( $taxonomy->singular_name, 'book', $tagArgs );

became

register_taxonomy( $taxonomy[$counter]->name, $book, $args );

and all went well.

I suspect this is a a problem with the memory of the host machine but I'm not sure if anyone has any insight as to why this worked I'd like to hear it. But for now this problem is solved.