Not enough information was provided for us to be able
to handle this bug. Please re-read the instructions at
http://bugs.php.net/how-to-report.php

If you can provide more information, feel free to add it
to this bug and change the status back to "Open".

Thank you for your interest in PHP.

I explain another time my problem:

i'm using php 4.2.3 with mysql 3.32.28

my PHP CODE:
$sql = "SELECT * FROM mytable";
$result = mysql_query($sql,$connection);

and PHP output is:
Warning: Supplied argument is not a valid MySQL result resource in c:\myfile.php on line 5

With PHP 4.1.3 this error doesn't occur, using the same PHP code

...in particular this code generates error :

mysql_fetch_row($result);

and

mysql_num_rows($result);

What does "echo mysql_error();" show if you execute it just after the mysql_query() call?

Derick

Currently, we have 3.23.x in the 3-tree, 3.32 is science fiction!

Please provide enough information for this possible error:
"Enough information" includes:
a) a "create table statement or a describe table output
b) mysql_errno return codes after mysql_query

Problem resolved!
The problem wasn't MySQL but null value of variables passed by URL.....and now it is a new problem ;-)

The directive " register_globals = Off " in php.ini causes null value variables passed via URL and so MySQL doesn't work.
Now it's allright.
Thank you to All.
Bye Bye