> One thing to be careful is if you are relying on 'transactions' to handle 
> anything. Obviously the transaction has to be in the same connection just to 
> work. Despite what others have said, the PDO connection will be different to 
> the generic mysql connection as it is a separate process. Persistent 
> connections will only reuse an already open connection, you can't connect two 
> processes to the same connection. You would not know which process was 
> accessing things.

According to the documentation:

"First, when connecting, the function would first try to find a (persistent) 
link that's already open with the same host, username and password. If one is 
found, an identifier for it will be returned instead of opening a new 

Therefore, providing you've configured PHP's --with-mysql and --with-pdo-mysql 
options with the same MySQL library, then as long as the host, username and 
password are the same, the same connection will be re-used for both the native 
(mysql_pconnect) connection and the PDO connection.

I'm not sure about the mysqli library, but I believe that lies beneath the 
mysql_* family of functions anyway so it shouldn't make a difference whether 
you're using libmysqlclient or mysqli.


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