MySQL in a Nutshell

Name

mysql_get_proto_info( )

Synopsis

mysql_get_proto_info([connection])

This returns the protocol version for the current connection to MySQL. An identifier may be given to retrieve the protocol version for a different connection.

...
$info = mysql_get_proto_info( );
print "Protocol Version:  $info \n";
...

Here are the results of running this script:

Protocol Version:  10