PRESTASHOP:如何告诉PDO类通过一个套接字连接，而不是“localhost”?

In Prestashop 1.6.1 in the /classes/db/DbPDO.php in the function _getPDO I see that the PDO the dsn connection string is built conditionally. In particular the following snippet is of interest:In Prestashop 1.6.1 in the /classes/db/DbPDO.ph