From:             JULES at SITEPOINT dot COM
Operating system: RH linux 2.4.18
PHP version:      4.3.0
PHP Bug Type:     MySQL related
Bug description:  Simultaneous connections with same user/password do not work.

When making two simultaneous connections to a MySQL server using the same
username / password combination, the MySQL link resource returned is the
same.  The upshot of this is that I am unable to use these 2 connections
to simultaneously work with 2 different databases that happen to share one
user/pass set.  

Put simply: If I call mysql_select_db() on one connection, it changes the
selected DB on the other connection, too.  The following code illustrates
the sharing of the connection by executing a bogus query on one connection
then calling mysql_error() on both connections.

<?
        $conn1 = mysql_connect ("localhost", "sales", "xxxx");
        $conn2 = mysql_connect ("localhost", "sales", "xxxx");
        
        mysql_select_db("sales", $conn1);
        mysql_select_db("salesNEW", $conn2);
        
        mysql_query("SELECT blah FROM blah", $conn1);

        echo mysql_error($conn1)."<br />";
        echo mysql_error($conn2);
        
        echo "<br /><br />";

        echo $conn1."<br />";
        
        echo $conn2;

?>

The output is:

Table 'salesNEW.blah' doesn't exist
Table 'salesNEW.blah' doesn't exist

Resource id #2
Resource id #2


Notice that I'm executing the broken query on $conn1.  Yet the error
message is returned on both $conn1 and $conn2.  Also notice that the
Resource id's are both 2, which easily explains this behavior.

It gets more bizarre when I swap over to mysql_pconnect().  The output
becomes:

Table 'salesNEW.blah' doesn't exist
Table 'salesNEW.blah' doesn't exist

Resource id #2
Resource id #3

So the behaviour is the same, but PHP clearly thinks it has 2 seperate
connections this time.

To determine whether PHP or MySQL was causing this bug, I used 2
simultaneous instances of the mysql command line client and verified that
it happily coped with the situation.
-- 
Edit bug report at http://bugs.php.net/?id=22654&edit=1
-- 
Try a CVS snapshot:         http://bugs.php.net/fix.php?id=22654&r=trysnapshot
Fixed in CVS:               http://bugs.php.net/fix.php?id=22654&r=fixedcvs
Fixed in release:           http://bugs.php.net/fix.php?id=22654&r=alreadyfixed
Need backtrace:             http://bugs.php.net/fix.php?id=22654&r=needtrace
Try newer version:          http://bugs.php.net/fix.php?id=22654&r=oldversion
Not developer issue:        http://bugs.php.net/fix.php?id=22654&r=support
Expected behavior:          http://bugs.php.net/fix.php?id=22654&r=notwrong
Not enough info:            http://bugs.php.net/fix.php?id=22654&r=notenoughinfo
Submitted twice:            http://bugs.php.net/fix.php?id=22654&r=submittedtwice
register_globals:           http://bugs.php.net/fix.php?id=22654&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=22654&r=php3
Daylight Savings:           http://bugs.php.net/fix.php?id=22654&r=dst
IIS Stability:              http://bugs.php.net/fix.php?id=22654&r=isapi
Install GNU Sed:            http://bugs.php.net/fix.php?id=22654&r=gnused

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