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 three different MySQL API extensions:
Section 21.9.3, "MySQL Improved
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.
Section 21.9.4, "MySQL
Functions (PDO_MYSQL) (
MySQL (PDO))": 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.
Section 21.9.2, "Original MySQL API
Mysql)": Available for PHP versions 4 and 5, this extension is
intended for use with MySQL versions prior to MySQL 4.1. This extension does not support the improved
authentication protocol used in MySQL 4.1, nor does it support prepared statements or multiple
statements. To use this extension with MySQL 4.1, you will likely configure the MySQL server to set the
system variable to 1 (see Section
Client does not support authentication protocol").
This extension is deprecated as of PHP 5.5.0, and its use is highly discouraged. All users are
encouraged to migrate to either
For further information, see Section 18.104.22.168, "Choosing an
The PHP distribution and documentation are available from the
Portions of this section are Copyright (c) 1997-2012
the PHP Documentation Group This material may be distributed only subject to the terms and
conditions set forth in the Creative Commons Attribution 3.0 License or later. A copy of the Creative Commons
Attribution 3.0 license is distributed with this manual. The latest version is presently available at