Runtime Configuration

The behaviour of these functions is affected by settings in php.ini.

PDO Configuration Options

Name	Default	Changeable	Changelog
pdo.dsn.*		php.ini only

For further details and definitions of the PHP_INI_* modes, see the Where a configuration setting may be set.

Here's a short explanation of the configuration directives.

pdo.dsn.* string

Defines DSN alias. See PDO::__construct() for thorough explanation.