str_word_count() function doesn't display Arabic language properly

if (!function_exists('mb_str_word_count'))
{
    function mb_str_word_count($string, $format = 0, $charlist = '[]') {
        $string=trim($string);
        if(empty($string))
            $words = array();
        else
            $words = preg_split('~[^\p{L}\p{N}\']+~u',$string);
        switch ($format) {
            case 0:
                return count($words);
                break;
            case 1:
            case 2:
                return $words;
                break;
            default:
                return $words;
                break;
        }
    }
}

substr_count($text, ' ') + 1;

public function customWordCount($content_text)
{
    $resultArray = explode(' ',trim($content_text));
    foreach ($resultArray as $key => $item)
    {
        if (in_array($item,["|",";",".","-","=",":","{","}","[","]","(",")"]))
        {
            $resultArray[$key] = '';
        }
    }

    $resultArray = array_filter($resultArray);
    return count($resultArray);
}