PHPUnit_Framework_Assert::containsOnly PHP Method

    public static function containsOnly($type)
    {
        return new PHPUnit_Framework_Constraint_TraversableContainsOnly($type);
    }

/**
 * Returns a PHPUnit_Framework_Constraint_TraversableContainsOnly matcher
 * object.
 *
 * @param  string $type
 * @return PHPUnit_Framework_Constraint_TraversableContainsOnly
 * @since  Method available since Release 3.1.4
 */
function containsOnly($type)
{
    return PHPUnit_Framework_Assert::containsOnly($type);
}