Refactor to allow built-in public taxonomies to be displayed

also modifies the view to show singular name

includes/Admin/Post_Type_Form_Page.php

@@ -85,7 +85,7 @@ public function render_form(): void {
 
 		$post_type_data = null;
 		$post_type      = get_post_type_object( $post_type_name );
-		$taxonomies     = get_taxonomies( array( '_builtin' => false ) );
+		$taxonomies     = $this->get_taxonomies_filtered();
 
 		if ( $post_type instanceof WP_Post_Type ) {
 			$post_types     = get_option( CUSTOM_PTT_POST_TYPE_OPTION_NAME, array() );
@@ -94,4 +94,27 @@ public function render_form(): void {
 
 		require __DIR__ . '/templates/custom-ptt-post-types-form.php';
 	}
+
+	/**
+	 * Filter taxonomies to show built-in public ones as well as custom ones.
+	 *
+	 * @return array
+	 *
+	 * @since 0.2.1
+	 */
+	private function get_taxonomies_filtered(): array {
+		$taxonomies          = get_taxonomies( array(), 'objects' );
+		$filtered_taxonomies = array();
+
+		foreach ( $taxonomies as $key => $taxonomy ) {
+
+			if ( $taxonomy->_builtin && ! $taxonomy->public ) {
+				continue;
+			}
+
+			$filtered_taxonomies[ $key ] = $taxonomy;
+		}
+
+		return $filtered_taxonomies;
+	}
 }

includes/Admin/templates/custom-ptt-post-types-form.php

@@ -72,10 +72,16 @@
 					<div class="mb-6">
 						<label class="block text-gray-700 text-sm font-bold mb-2"><?php esc_html_e( 'Attach to Taxonomies:', 'custom-post-types-post-types' ); ?></label>
 						<div class="flex flex-col pl-4">
-							<?php foreach ( $taxonomies as $taxonomy_slug => $taxonomy_label ) { ?>
+							<?php
+							foreach ( $taxonomies as $taxonomy_slug => $taxonomy ) {
+								if ( ! $taxonomy instanceof WP_Taxonomy ) {
+									continue;
+								}
+
+								?>
 								<div class="mb-2">
-									<input type="checkbox" id="taxonomy-<?php echo esc_attr( $taxonomy_slug ); ?>" name="taxonomies[]" value="<?php echo esc_attr( $taxonomy_slug ); ?>" <?php checked( in_array( $taxonomy_slug, $post_type_data['taxonomies'] ?? array(), true ) ); ?> class="form-checkbox">
-									<label for="taxonomy-<?php echo esc_attr( $taxonomy_slug ); ?>" class="text-sm"><?php echo esc_html( $taxonomy_label ); ?></label>
+									<input type="checkbox" id="taxonomy-<?php echo esc_attr( $taxonomy->rewrite->slug ); ?>" name="taxonomies[]" value="<?php echo esc_attr( $taxonomy->rewrite->slug ); ?>" <?php checked( in_array( $taxonomy->rewrite->slug, $post_type_data['taxonomies'] ?? array(), true ) ); ?> class="form-checkbox">
+									<label for="taxonomy-<?php echo esc_attr( $taxonomy->rewrite->slug ); ?>" class="text-sm"><?php echo esc_html( $taxonomy->labels->singular_name ); ?></label>
 								</div>
 							<?php } ?>
 						</div>