Posted by Colin McKinnon on 03/03/07 23:21

Efi Merdler wrote:

> Hi,
> I created a very simple application that reads and writes to a file, I
> was wondering if fopen when opening a file for write access blocks
> this file, i.e. when another user runs this script the script will
> halt until the first user closes its file handle.
>

What happenned when you tested it?

Here's a hint:
<?php
print "ready to start\n";
flush();
$fh=fopen('/tmp/test','w');
if (is_resource($fh)) {
print "opened...\n";
flush();
sleep(30);
print "Exiting\n";
fclose($fh);
} else {
print "failed to open\n";
}
?>

(if you run two instances of this script, the second will do one of three
things - you've only considered two possibilities so far)

> If not how can I change php behavior to block such access?
>

flock()

C.

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