Как исправить ошибку Deprecated: preg_replace при добавлении русского комментария к фото?

$t = preg_replace( '#%u([0-9A-F]{1,4})#ie', "'&#' . hexdec('\\1') . ';'", $t )

function convert_unicode_photo( $t, $to = 'windows-1251' ) {
    $to = strtolower($to);
    if ($to == 'utf-8') {
        $t = preg_replace( '#%u([0-9A-F]{1,4})#ie', "decode_to_utf8_photo(hexdec('\\1'))", utf8_encode($t) );
        $t = urldecode ($t);
    }else{
        $t = preg_replace( '#%u([0-9A-F]{1,4})#ie', "'&#' . hexdec('\\1') . ';'", $t );
        $t = urldecode ($t);
        $t = @html_entity_decode($t, ENT_NOQUOTES, $to);
    }
    return $t;
}