Description:
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From manual page: http://www.php.net/pdostatement.bindparam%23Parameters
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bindParam() really ought to be able to accept a null parameter.  

$varNull;
$stmt->bindParam(":param1",$varNull);

would make much more sense rather than the application checking and converting 
the 
null every time.  I imagine a simple empty check would work fine within the 
implementation.  Seems similar to bug#15719. Pleeease consider this 
functionality as it would save a ton of us more time. 

Thanks!