Posted by Jason Petersen on 03/02/05 18:06

On Wed, 2 Mar 2005 13:02:39 +0200, William Stokes <kalles@operamail.com> wrote:
> Hello
>
> Can someone explain this to me. I don't know how to read this.
>
> if (!$variable = mysql_query("select id,sessid from users where ...
>
> What is this "if(!"

This is a way to run a SQL query, capture the return value, and
perform an action if the query failed. For code readability, I would
probably write that as two statements:

$variable = mysql_query("SELECT * FROM blah");
if(!$variable) { error_handler(mysql_error()); }

See the documentation for information on mysql_query return values:
http://us2.php.net/manual/en/function.mysql-query.php

Jason

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