PHP is a server-side, HTML-embedded scripting language that may be used to create dynamic Web pages. It is available for most operating systems and Web servers, and can access most common databases, including MySQL. PHP may be run as a separate program or compiled as a module for use with a Web server.
PHP provides several different MySQL API extensions:
The PHP documentation assumes PHP 7 and higher is used; functionality specific to PHP 5 and below is not documented.
MySQLi: Stands for “MySQL, Improved”; this extension is available as of PHP 5.0.0. It is intended for use with MySQL 4.1.1 and later. This extension fully supports the authentication protocol used in MySQL 5.0, as well as the Prepared Statements and Multiple Statements APIs. In addition, this extension provides an advanced, object-oriented programming interface.
PDO_MySQL: Not its own API, but instead it's a MySQL driver for the PHP database abstraction layer PDO (PHP Data Objects). The PDO MySQL driver sits in the layer below PDO itself, and provides MySQL-specific functionality. This extension is available as of PHP 5.1.0.
This documentation, and other publications, sometimes uses the
Connector/PHP. This term refers to the
full set of MySQL related functionality in PHP, which includes
the APIs that are described in the preceding discussion, along
core library and all of its plugins.
The PHP distribution and documentation are available from the PHP website.