Opening a connection to a mysql database server before opening a connection to an imap server appears to fail.

In a script that I was testing a opened a mysql database to authenticate a user to a RADIUS table before opening an imap connection for the user.  The imap_open function returned something other than false, however subsequent calls to that imap connection would fail.

Specifically doing...

<?
$db_server = "my.db.server";
$db_username = "username";
$db_password = "*****";
$mailbox = "{myimap.server.com:143}INBOX";
$imap_user = "myimapuser";
$imap_password = "myimappassword";

$mysql_connection = mysql_open($db_server, $db_username, $db_password);

$mbox = imap_open($mailbox, $imap_user, $imap_password);
   || die("imap didn't work: " . imap_last_error());

echo "This is my imap stream: " . $mbox . "<br>";
if (imap_ping($mbox))
{
   echo "Imap is alive!<br>";
}
else
{
   echo "Imap is dead!<br>";
}
?>

Will always result in an output of 
This is my imap stream: 1 (or some other number)
Imap is dead!

However simply reversing the order of the mysql_open and imap_open statements so that you open the imap connection first seems to allow both imap and mysql to function correctly.