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Posted by jon.tjemsland on 05/04/06 22:52
What OS is the server that this script is running on? Flock will work
to lock a file if you are running your script on a server with an OS
that is compatible with flock. Both NFS and FAT file systems are
incompatible.
Here is a flock sample from (http://us3.php.net/flock):
$fp = fopen("/tmp/lock.txt", "w+");
if (flock($fp, LOCK_EX)) { // do an exclusive lock
fwrite($fp, "Write something here\n");
flock($fp, LOCK_UN); // release the lock
} else {
echo "Couldn't lock the file !";
}
fclose($fp);
Regards
Jon Tjemsland
abrtlt@yahoo.com wrote:
> I read in Programming PHP (O'Reilly) that flock() "cannot prevent two
> PHP scripts running in the same web server process from accessing a
> file at the same time".
> In my case a single PHP script appends text strings to an existing text
> file. Several clients may trigger the same script on the same web page
> and thus more than one PHP instance might try to open and append text
> to the same file at the same time. I would assume that using flock()
> _does_ in fact prevent simultaneous access in this case. Am I correct?
> Thanks!
>
> Andrew
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