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I want to add a specific tag to posts being published, I tried the following code and searched for answers here but it doesn't work. Does anyone have an idea why?

function tag_to_published_post( $post_id, $post, $update ) {
// check if just an update
if ( $update ) {
    return;
}
//add tag
wp_set_post_tags( $post_id, 'tag-to-be-added', true ); 
} 
add_action( 'save_post', 'tag_to_published_post', 10, 3);

Thanks for any ideas!

本文标签: actionsAdd Tag to post after publishing