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Last Updated on: September 18, 2020

Assign Default Taxonomies to Custom Post Types in WordPress [PHP Snippet]

If you want to assign the default blog post taxonomies to your custom post types then you can easily achieve that using this powerful function PHP code snippet.

/* Advanced Scripts Method to Add This Snippet */
/* 
Title: Assign Default Taxonomies to Custom Post Types
Type: PHP: Custom Code
Location: Plugins Loaded
Priority: 10
*/

function my_cptui_add_post_types_to_archives( $query ) {
	// We do not want unintended consequences.
	if ( is_admin() || ! $query->is_main_query() ) {
		return;    
	}

	if ( is_category() || is_tag() && empty( $query->query_vars['suppress_filters'] ) ) {

		// Replace these slugs with the post types you want to include.
		$cptui_post_types = array( 'custom-post-type');

		$query->set(
	  		'post_type',
			array_merge(
				array( 'post' ),
				$cptui_post_types
			)
		);
	}
}
add_filter( 'pre_get_posts', 'my_cptui_add_post_types_to_archives' );

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