Write files with high concurrency

function write($data) {
    $return = false;
    if ($handle = @fopen('error.txt','a+') ) {
        $i=0;
        while (!flock($handle,2) && $i++ < 3 ) {
            usleep(500000);
        }

        if ($i < 3 && fwrite($handle,$data . "rn")) {
            flock($handle,3);
            $return  = true;
        }

        fclose($handle);
    }
    return $return;
}