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wp_set_post_categories › WordPress Function

Since2.1.0
Deprecatedn/a
› wp_set_post_categories ( $post_id = 0, $post_categories = array(), $append = false )
Parameters: (3)
  • (int) $post_id Optional. The Post ID. Does not default to the ID of the global $post. Default 0.
    Required: No
    Default: —
  • (int[]|int) $post_categories Optional. List of category IDs, or the ID of a single category. Default empty array.
    Required: No
    Default: array()
  • (bool) $append If true, don't delete existing categories, just add on. If false, replace the categories with the new categories.
    Required: No
    Default: false
Returns:
  • (array|false|WP_Error) Array of term taxonomy IDs of affected categories. WP_Error or false on failure.
Defined at:
Codex:

Sets categories for a post.

If no categories are provided, the default category is used.


Related Functions: wp_get_post_categories, wp_set_post_cats, wp_set_post_terms, wp_list_categories, wp_set_post_tags

Source 

function wp_set_post_categories( $post_id = 0, $post_categories = array(), $append = false ) {
	$post_id     = (int) $post_id;
	$post_type   = get_post_type( $post_id );
	$post_status = get_post_status( $post_id );

	// If $post_categories isn't already an array, make it one.
	$post_categories = (array) $post_categories;

	if ( empty( $post_categories ) ) {
		/**
		 * Filters post types (in addition to 'post') that require a default category.
		 *
		 * @since 5.5.0
		 *
		 * @param string[] $post_types An array of post type names. Default empty array.
		 */
		$default_category_post_types = apply_filters( 'default_category_post_types', array() );

		// Regular posts always require a default category.
		$default_category_post_types = array_merge( $default_category_post_types, array( 'post' ) );

		if ( in_array( $post_type, $default_category_post_types, true )
			&& is_object_in_taxonomy( $post_type, 'category' )
			&& 'auto-draft' !== $post_status
		) {
			$post_categories = array( get_option( 'default_category' ) );
			$append          = false;
		} else {
			$post_categories = array();
		}
	} elseif ( 1 === count( $post_categories ) && '' === reset( $post_categories ) ) {
		return true;
	}

	return wp_set_post_terms( $post_id, $post_categories, 'category', $append );
}