staylor / WordPress

 * @param string $capability Capability or role name.

 * @return bool

 */

function author_can( $post, $capability ) {

	if ( !$post = get_post($post) )

		return false;

	$author = get_userdata( $post->post_author );

	if ( ! $author )

		return false;

	$args = array_slice( func_get_args(), 2 );

	$args = array_merge( array( $capability ), $args );

	return call_user_func_array( array( $author, 'has_cap' ), $args );

}

/**

 * Whether a particular user has capability or role.

 * @param string $capability Capability or role name.

 * @return bool

 */

function user_can( $user, $capability ) {

	if ( ! is_object( $user ) )

		$user = get_userdata( $user );

	if ( ! $user || ! $user->exists() )

		return false;

	$args = array_slice( func_get_args(), 2 );

	$args = array_merge( array( $capability ), $args );

	return call_user_func_array( array( $user, 'has_cap' ), $args );

}

/**

 * Retrieves the global WP_Roles instance and instantiates it if necessary.