fopen and flock

[toshog]

hi...

here is the code:

$file = "numbers";
$fp = fopen($file, "r+");

if (flock($fp, LOCK_EX)) { // do an exclusive lock
        $c = fread($fp,filesize($file));
        $c = intval($c) + 1;
        rewind($fp);
        fwrite($fp, $c);
        flock($fp, LOCK_UN); // release the lock
} else {
    echo "Couldn't lock the file !";
}

fclose($fp);

very simple stuff. i need to open file get the number in there and then write back to it with the number increased with 1 while no other process can read the file.
fopen($file, "w+") doesn't work in this case.

is there any way to overwrite the file content without actually using rewind?

thanks...