val_num.php

См. документацию.

<?php
 
IncludeModuleLangFile(__FILE__);
 
class CFormValidatorNumber
{
    public static function GetDescription()
    {
        return array(
            "NAME" => "number", // validator string ID
            "DESCRIPTION" => GetMessage("FORM_VALIDATOR_VAL_NUM_DESCRIPTION"), // validator description
            "TYPES" => array("text", "textarea"), //  list of types validator can be applied.
            "HANDLER" => array("CFormValidatorNumber", "DoValidate") // main validation method
        );
    }
 
    public static function DoValidate($arParams, $arQuestion, $arAnswers, $arValues)
    {
        global $APPLICATION;
 
        $prepared = [];
 
        foreach ($arValues as $value)
        {
            if (is_int($value))
            {
                continue;
            }
            elseif (is_string($value))
            {
                // empty string is not a number but we won't return error - crossing with "required" mark
                if ($value != "")
                {
                    if (!preg_match('/^(-)?[0-9]+$/', $value, $prepared))
                    {
                        $APPLICATION->ThrowException(GetMessage("FORM_VALIDATOR_VAL_NUM_ERROR"));
                        return false;
                    }
                }
            }
            else
            {
                $APPLICATION->ThrowException(GetMessage("FORM_VALIDATOR_VAL_NUM_ERROR"));
                return false;
            }
        }
 
        return true;
    }
}
 
AddEventHandler("form", "onFormValidatorBuildList", array("CFormValidatorNumber", "GetDescription"));