content

$text = preg_replace('~[\x{10000}-\x{10FFFF}]~u', '', $text);

$text = 'бла-бла-бла :)';

$tr = array(
        "А"=>"A","Б"=>"B","В"=>"V","Г"=>"G","Д"=>"D",
        "Е"=>"E","Ё"=>"YO","Ж"=>"J","З"=>"Z","И"=>"I",
        "Й"=>"Y","К"=>"K","Л"=>"L","М"=>"M","Н"=>"N",
        "О"=>"O","П"=>"P","Р"=>"R","С"=>"S","Т"=>"T",
        "У"=>"U","Ф"=>"F","Х"=>"H","Ц"=>"C","Ч"=>"CH",
        "Ш"=>"SH","Щ"=>"SCH","Ъ"=>"","Ы"=>"YI","Ь"=>"",
        "Э"=>"E","Ю"=>"YU","Я"=>"YA","а"=>"a","б"=>"b",
        "в"=>"v","г"=>"g","д"=>"d","е"=>"e","ё"=>"yo","ж"=>"j",
        "з"=>"z","и"=>"i","й"=>"y","к"=>"k","л"=>"l",
        "м"=>"m","н"=>"n","о"=>"o","п"=>"p","р"=>"r",
        "с"=>"s","т"=>"t","у"=>"u","ф"=>"f","х"=>"h",
        "ц"=>"c","ч"=>"ch","ш"=>"sh","щ"=>"sch","ъ"=>"y",
        "ы"=>"y","ь"=>"","э"=>"e","ю"=>"yu","я"=>"ya"
    );
$text_tmp = strtr($text,$tr); // в транслит
$text_tmp = preg_replace('/[^A-Za-z0-9_\-]/', '', $text_tmp); // удаляем мусор
$text = strtolower(trim($text_tmp, '-')); // преобразуем в нижний регистр

echo $text;

/**
* Обрезает строку до определённого количества символов не разбивая слова.
* Поддерживает многобайтовые кодировки.
* @param string $str строка
* @param int $length длина, до скольки символов обрезать
* @param string $postfix постфикс, который добавляется к строке
* @param string $encoding кодировка, по-умолчанию 'UTF-8'
* @return string обрезанная строка
*/
function mbCutString($str, $length, $postfix='...', $encoding='UTF-8')
{
    if (mb_strlen($str, $encoding) <= $length) {
        return $str;
    }
  
    $tmp = mb_substr($str, 0, $length, $encoding);
    return mb_substr($tmp, 0, mb_strripos($tmp, ' ', 0, $encoding), $encoding) . $postfix;
}

function upFirstLetter($str, $encoding = 'UTF-8')
{
    return mb_strtoupper(mb_substr($str, 0, 1, $encoding), $encoding)
    . mb_substr($str, 1, null, $encoding);
}

echo upFirstLetter('дом'); // выведет "Дом"

function debug_to_console($data) {
    $output = $data;
    if (is_array($output))
        $output = implode(',', $output);
    echo "<script>console.log('Debug Objects: " . $output . "' );</script>";
}

$str = '{"10":"OK"}';
$strWithoutChars = preg_replace('/[^0-9]/', '', $str);
echo $strWithoutChars;

$text = preg_replace('/[^\S\r\n]+/', ' ', $text);

$y = '000000011';
echo (int)$y;

или

$y = '000000011';
print ltrim($y,'0');