Add tag to post api wordpress

3 comments

1. You’ll find an index of a good chunk of the WordPress API here on codex. The function you want is wp_set_post_tags(), but follow the links from that page to related functions.

   Edit: this should remove a tag from a post, per comment below

   // $post is your post object, e.g. from: global $post;
   // $target is tag you want to remove
   
   // get an array of current tags on post
   $tags = wp_get_post_tags($post->ID, array('fields' => 'names'));
   
   // remove selected tag from array
   $key = array_search($target, $tags);
   if ($key !== false) {
       unset($tags[$key]);
   }
   
   // set new list of tags, without $target
   wp_set_post_tags($post->ID, $tags, false);
   

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2. You would use the wp_insert_term() function to insert a new tag:

   wp_insert_term( 'post_tag', 'happy' );
   

   Then after creating your terms, you would add them to the post of your choice using the wp_set_post_terms() function, like so:

   wp_set_post_terms( $post_id, 'happy', 'post_tag', true);
   

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3. Google Knows it.

   If you wanted to add a categories to a post with the ID of 42:

   $cat_ids = array( 6,8 );
       //to make sure the terms IDs is integers:
       //$cat_ids = array_map('intval', $cat_ids);
       //$cat_ids = array_unique( $cat_ids );
   wp_set_object_terms( '42', $cat_ids, 'category' );
   

   If you wanted to clear/remove all categories from a post with the ID of 42:

   wp_set_object_terms( '42', NULL, 'category' );
   

   read more about wp_set_object_terms

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