The PDO_MYSQL Data Source Name (DSN) is composed of the following elements:
The DSN prefix is mysql:.
mysql:
host
The hostname on which the database server resides.
port
The port number where the database server is listening.
dbname
The name of the database.
unix_socket
The MySQL Unix socket (shouldn't be used with host or port).
The following example shows a PDO_MYSQL DSN for connecting to MySQL databases:
mysql:host=localhost;dbname=testdb
More complete examples:
mysql:host=localhost;port=3307;dbname=testdb mysql:unix_socket=/tmp/mysql.sock;dbname=testdb