has_term() WordPress Function

function has_term( $term = '', $taxonomy = '', $post = null ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return false;
	}

	$r = is_object_in_term( $post->ID, $taxonomy, $term );
	if ( is_wp_error( $r ) ) {
		return false;
	}

	return $r;
}
Uses	Description
wp-includes/taxonomy.php:is_object_in_term()	Determines if the given object is associated with any of the given terms.
wp-includes/post.php:get_post()	Retrieves post data given a post ID or post object.
wp-includes/load.php:is_wp_error()	Checks whether the given variable is a WordPress Error.
Used By	Description
wp-includes/category-template.php:has_category()	Checks if the current post has any of given category.
wp-includes/category-template.php:has_tag()	Checks if the current post has any of given tags.
wp-includes/canonical.php:redirect_canonical()	Redirects incoming links to the proper URL based on the site url.
wp-includes/post-formats.php:has_post_format()	Check if a post has any of the given formats, or any format.