add_post_meta() WordPress Function

function add_post_meta( $post_id, $meta_key, $meta_value, $unique = false ) {
	// Make sure meta is added to the post, not a revision.
	$the_post = wp_is_post_revision( $post_id );
	if ( $the_post ) {
		$post_id = $the_post;
	}

	return add_metadata( 'post', $post_id, $meta_key, $meta_value, $unique );
}
Uses	Description
wp-includes/revision.php:wp_is_post_revision()	Determines if the specified post is a revision.
wp-includes/meta.php:add_metadata()	Adds metadata for the specified object.
Used By	Description
wp-includes/post.php:wp_check_for_changed_dates()	Check for changed dates for published post objects and save the old date.
wp-admin/includes/class-wp-privacy-policy-content.php:WP_Privacy_Policy_Content::get_suggested_policy_text()	Check for updated, added or removed privacy policy information from plugins.
wp-admin/includes/class-wp-privacy-policy-content.php:WP_Privacy_Policy_Content::_policy_page_updated()	Update the cached policy info when the policy page is updated.
wp-includes/class-wp-customize-manager.php:WP_Customize_Manager::trash_changeset_post()	Trashes or deletes a changeset post.
wp-includes/post.php:wp_add_trashed_suffix_to_post_name_for_post()	Adds a trashed suffix for a given post.
wp-admin/includes/image.php:wp_generate_attachment_metadata()	Generate attachment meta data and create image sub-sizes for images.
wp-admin/includes/media.php:media_sideload_image()	Downloads an image from the specified URL, saves it as an attachment, and optionally attaches it to a post.
wp-admin/includes/post.php:wp_write_post()	Creates a new post from the “Write Post” form using `$_POST` information.
wp-admin/includes/post.php:add_meta()	Adds post meta data defined in the `$_POST` superglobal for a post with given ID.
wp-includes/functions.php:do_enclose()	Check content for video and audio links to add as enclosures.
wp-includes/post.php:_publish_post_hook()	Hook to schedule pings and enclosures when a post is published.
wp-includes/post.php:wp_check_for_changed_slugs()	Check for changed slugs for published post objects and save the old slug.
wp-includes/post.php:wp_insert_post()	Insert or update a post.
wp-includes/post.php:wp_trash_post()	Move a post or page to the Trash
wp-includes/post.php:wp_trash_post_comments()	Moves comments for a post to the Trash.
wp-includes/class-wp-xmlrpc-server.php:wp_xmlrpc_server::add_enclosure_if_new()	Adds an enclosure to a post if it’s new.
wp-includes/class-wp-xmlrpc-server.php:wp_xmlrpc_server::set_custom_fields()	Set custom fields for post.