[Resolved] fopen question

[NoBullMan]

Hi,
I want to open a file for debugging purposes and want to know how I can access it (write to it) from across mutiple php files. I want to be able to write debugging information from within mutiple php files. Can I store the file locally or does it have to be on the server? My php files are a web hosting company's server.

I tried to store the file pointer returned by fopen as a session variable. I get a warning: fopen (http://www.mydomain.com/somedir/debug) failed to open stream: HTTP wraper does not support writeable connections.
Thisis followed by a bunch of:
warning: fwrite(): supplied argument is not a valid stream resource

if (!isset($_SESSION['fh'])) { 
  $fh = fopen("http://www.mydomain.com/somedir/debug", "w"); 
  $_SESSION['fh'] = $fh;
}
.....
.....
fwrite($_SESSION['fh'], "\nsome debugging text \nmsg: ".$msg."msg_type: ".$msg_type);

Thanx.

[NoBullMan]

Found out that I had to use error_log() function.
http://www.php.net/error_log

fopen() returns a resource and resources are not serializable, therefore not saved in session variables.