i did two code to test :
1° have one query with connection per PDO;
2° have a simple mysql_connection.
The firts it works, not problem.
but the other have problems to connect....
to make a connection with mysql_query i use:
mysql_query($host,$user,$password) while in PDO i use a string like was suggested in the doc that you send;
how i can fill the $host to obtain success on my connection