losing MySQL resource

I'm maintaining a session.  I successfully connect to a database ($DBConnect
= mysql_connect()).  I save the connection resource in a session variable
($_SESSION['connection'] = $DBConnect) ... to use in subsequent queries.  It
remains valid while the user is on the current page.
print_r($_SESSION['connection']) yields 'Resource id #3', for instance.

User browses to a new page ... in the same session.  $_SESSION['$DBConnect']
no longer references a valid mysql resource.
print_r($_SESSION['connection']) yields '0'.

Other "ordinary" values saved in $_SESSION variables remain valid.

Is there something special about a mysql resource?




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