What is PDO and how to install it on Unix and Windows systems?

What is PDO? PDO is the abbreviation of PHP Data Object, which is a set of PHP extensions that provide core PDO classes and database-specific drivers. Provides a lightweight, vendor-neutral data access abstraction layer. Focus on data access abstractions, not database abstractions. PDO requires new object-oriented features to be added to the core of PHP 5, so it will not run in earlier versions of PHP.

Installing PDO

PDO is divided into two parts:

-The core that provides the interface.

- Drivers for specific access.

Installing PDO on Unix systems:

Since PHP 5.1.0, PDO (core) and PDO_SQLITE driver (SQLITE driver) are enabled by default. To access other databases, the PDO driver must be enabled.

To install PDO as a shared module, you need to update php.ini so that the PDO extension is automatically loaded when PHP is running. You will also need to enable other database-specific drivers, and they must be listed after the pdo.so line because PDO must be initialized before database-specific extensions can be loaded. If you build PDO and database-specific extensions statically, you can skip this step:

extension = pdo.so

Install PDO on Windows systems:

PDO and all major drivers The programs all come with PHP as a shared extension, you only need to edit the PHP .ini file to activate:

extension = php_pdo.dll

For PHP 5.3 and above, this step is unnecessary because PDO no longer requires the DLL.

Next, select the other database-specific DLL files and either load them at runtime using dl() or enable them in php.ini below php_pdo.dll.

To get the effect of the new configuration in the PHP.ini file, you need to restart PHP.

Related recommendations: "PHP Tutorial"

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