public function __construct($startField, $stopField, $options = array(), $messages = array())
 {
     parent::__construct($startField, sfValidatorSchemaCompare::LESS_THAN, $stopField, $options, $messages);
 }
 /**
  * Constructor.
  *
  * Available options:
  * 
  * @see sfValidatorSchemaCompare for rest of options
  *  * skip_if_one_empty:  Skip validation if at least one value is empty.
  *  * skip_if_both_empty: Skip validation only if both values empty.
  *  * left_field:         The left field name
  *  * operator:           The comparison operator
  *                          * self::EQUAL
  *                          * self::NOT_EQUAL
  *                          * self::IDENTICAL
  *                          * self::NOT_IDENTICAL
  *                          * self::LESS_THAN
  *                          * self::LESS_THAN_EQUAL
  *                          * self::GREATER_THAN
  *                          * self::GREATER_THAN_EQUAL
  *  * right_field:        The right field name
  *  * throw_global_error: Whether to throw a global error (false by default) or an error tied to the left field
  *
  * @param string $leftField   The left field name
  * @param string $operator    The operator to apply
  * @param string $rightField  The right field name
  * @param array  $options     An array of options
  * @param array  $messages    An array of error messages
  *
  * 
  */
 public function __construct($leftField, $operator, $rightField, $options = array(), $messages = array())
 {
     $this->addOption('skip_if_one_empty', false);
     $this->addOption('skip_if_both_empty', false);
     parent::__construct($leftField, $operator, $rightField, $options, $messages);
 }