common.php

<?php
namespace Bitrix\Pull;
 
class Common
{
    public static function jsonEncode($params)
    {
        $option = JSON_UNESCAPED_UNICODE;
        static::recursiveConvertDateToString($params);
 
        return \Bitrix\Main\Web\Json::encode($params, $option);
    }
 
    public static function recursiveConvertDateToString(array &$params)
    {
        array_walk_recursive($params, function(&$item, $key){
            if ($item instanceof \Bitrix\Main\Type\DateTime)
            {
                $item = date('c', $item->getTimestamp());
            }
        });
    }
 
    public static function findInvalidUnicodeSymbols(array $input, $currentPath = "")
    {
        if(!defined("BX_UTF"))
        {
            return false;
        }
 
        foreach ($input as $k => $v)
        {
            if(is_string($input[$k]))
            {
                if(!mb_check_encoding($input[$k]))
                {
                    return $currentPath . "/" . $k;
                }
            }
            else if (is_array($input[$k]))
            {
                $subResult = static::findInvalidUnicodeSymbols($input[$k], $currentPath . "/" . $k);
                if($subResult)
                {
                    return $subResult;
                }
            }
        }
 
        return false;
    }
}