wp_set_post_tags() – Function | Developer.WordPress.org

Sets the tags for a post.

Description

$post_idintoptional: The Post ID. Does not default to the ID of the global $post.
$tagsstring|arrayoptional: An array of tags to set for the post, or a string of tags separated by commas.
Default:''
$appendbooloptional: If true, don’t delete existing tags, just add on. If false, replace the tags with the new tags.
Default:false

array|false|WP_Error Array of term taxonomy IDs of affected terms. WP_Error or false on failure.

If you set IDs of an existing tag in the array, WordPress assigns the existing tag.

If you pass text in the array, WP will create a tag if it doesn’t exist and assigns it to the post

You can mix text and IDs. The text will create a term, if it not exists, the ID will be used for an existing tag – both get assigned to the post.

function wp_set_post_tags( $post_id = 0, $tags = '', $append = false ) {
	return wp_set_post_terms( $post_id, $tags, 'post_tag', $append );
}

Uses	Description
wp_set_post_terms()`wp-includes/post.php`	Sets the terms for a post.

Used by	Description
wp_add_post_tags()`wp-includes/post.php`	Adds tags to a post.
wp_insert_post()`wp-includes/post.php`	Inserts or update a post.

Version	Description
2.3.0	Introduced.