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PHP Manual

## 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 |

Here's a short explanation of the configuration directives.

`pdo.dsn.*` string

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

Installation
Resource Types
Installing/Configuring
PHP Manual