Method test

/**
 * Method to test if two values are not equal. To use this rule, the form
 * XML needs a validate attribute of equals and a field attribute
 * that is equal to the field to test against.
 *
 * @param   \SimpleXMLElement  $element  The SimpleXMLElement object representing the `<field>` tag for the form field object.
 * @param   mixed              $value    The form field value to validate.
 * @param   string             $group    The field name group control value. This acts as an array container for the field.
 *                                       For example if the field has name="foo" and the group value is set to "bar" then the
 *                                       full field name would end up being "bar[foo]".
 * @param   Registry           $input    An optional Registry object with the entire data set to validate against the entire form.
 * @param   Form               $form     The form object for which the field is being tested.
 *
 * @return  boolean  True if the value is valid, false otherwise.
 *
 * @since   1.7.0
 * @throws  \InvalidArgumentException
 * @throws  \UnexpectedValueException
 */
public function test(\SimpleXMLElement $element, $value, $group = null, Registry $input = null, Form $form = null)
{
    $field = (string) $element['field'];
    // Check that a validation field is set.
    if (!$field) {
        throw new \UnexpectedValueException(sprintf('$field empty in %s::test', \get_class($this)));
    }
    if ($input === null) {
        throw new \InvalidArgumentException(sprintf('The value for $input must not be null in %s', \get_class($this)));
    }
    // Test the two values against each other.
    if ($value != $input->get($field)) {
        return true;
    }
    return false;
}