Set Default Terms for your Custom Taxonomies

Wordpress - Set Default Terms for your Custom Taxonomies

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Original link

Set default category for custom post type

            
function mfields_set_default_object_terms( $post_id, $post ) {
    if ( 'publish' === $post->post_status && $post->post_type === 'your_custom_post_type' ) {
        $defaults = array(
            'your_taxonomy_id' => array( 'your_term_slug' )
            //'your_taxonomy_id' => array( 'your_term_slug', 'your_term_slug' )
            );
        $taxonomies = get_object_taxonomies( $post->post_type );
        foreach ( (array) $taxonomies as $taxonomy ) {
            $terms = wp_get_post_terms( $post_id, $taxonomy );
            if ( empty( $terms ) && array_key_exists( $taxonomy, $defaults ) ) {
                wp_set_object_terms( $post_id, $defaults[$taxonomy], $taxonomy );
            }
        }
    }
}
add_action( 'save_post', 'mfields_set_default_object_terms', 100, 2 );