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Function Reference/wp set post tags

Set tags for a post. Every tag that does not already exists will be automatically created. Uses wp_set_post_terms().

<?php wp_set_post_tags( $post_ID, $tags, $append ) ?>

$post_ID

(integer) (required) Post ID.

Default: 0

$tags

(string,array) (optional) List of tags. Can be an array or a comma separated string.

Default: array

$append

(boolean) (optional) If true, tags will be appended to the post. If false, tags will replace existing tags.

Default: false

Will return false if $post_id is not an integer or is 0. Will return null otherwise.

To add the tags meaning and life to the current tags of the post with ID 42:

wp_set_post_tags( 42, 'meaning,life', true );

Since: 2.3.0

wp_set_post_tags() is located in wp-includes/post.php.