22.10.1.1. Installing/Configuring

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22.10.1.1.1. Requirements

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In order to have these functions available, you must compile PHP with MySQL support.

22.10.1.1.2. Installation

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For compiling, simply use the --with-mysql[=DIR] configuration option where the optional [DIR] points to the MySQL installation directory.

Although this MySQL extension is compatible with MySQL 4.1.0 and greater, it doesn't support the extra functionality that these versions provide. For that, use the MySQLi extension.

If you would like to install the mysql extension along with the mysqli extension you have to use the same client library to avoid any conflicts.

22.10.1.1.2.1. Installation on Linux Systems

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22.10.1.1.2.1.1. PHP 4

Copyright 1997-2010 the PHP Documentation Group.

The option --with-mysql is enabled by default. This default behavior may be disabled with the --without-mysql configure option. If MySQL is enabled without specifying the path to the MySQL install DIR, PHP will use the bundled MySQL client libraries.

Users who run other applications that use MySQL (for example, auth-mysql) should not use the bundled library, but rather specify the path to MySQL's install directory, like so: --with-mysql=/path/to/mysql. This will force PHP to use the client libraries installed by MySQL, thus avoiding any conflicts.

22.10.1.1.2.1.2. PHP 5.0.x, 5.1.x, 5.2.x

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MySQL is not enabled by default, nor is the MySQL library bundled with PHP. Read this FAQ for details on why. Use the --with-mysql[=DIR] configure option to include MySQL support. You can download headers and libraries from http://www.mysql.com/.

22.10.1.1.2.1.3. PHP 5.3.0+

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In PHP 5.3.0 and above the MySQL-related database extensions use the MySQL Native Driver by default. This means that the MySQL Client Library (libmysql) is no longer required in order to support connection to a MySQL database. The extensions mysql, mysqli, and PHP_PDO_MYSQL are all enabled by default in PHP 5.3.0+, and all use the MySQL Native Driver by default. In each case no further installation steps are required in order to use these extensions, although you may want to set some preferences in php.ini depending on your requirements.

22.10.1.1.2.2. Installation on Windows Systems

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22.10.1.1.2.2.1. PHP 4

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The PHP MySQL extension is compiled into PHP.

22.10.1.1.2.2.2. PHP 5.0.x, 5.1.x, 5.2.x

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MySQL is no longer enabled by default, so the php_mysql.dll DLL must be enabled inside of php.ini. Also, PHP needs access to the MySQL client library. A file named libmysql.dll is included in the Windows PHP distribution and in order for PHP to talk to MySQL this file needs to be available to the Windows systems PATH. See the FAQ titled "How do I add my PHP directory to the PATH on Windows" for information on how to do this. Although copying libmysql.dll to the Windows system directory also works (because the system directory is by default in the system's PATH), it's not recommended.

As with enabling any PHP extension (such as php_mysql.dll), the PHP directive extension_dir should be set to the directory where the PHP extensions are located. See also the Manual Windows Installation Instructions. An example extension_dir value for PHP 5 is c:\php\ext

Note

If when starting the web server an error similar to the following occurs: "Unable to load dynamic library './php_mysql.dll'", this is because php_mysql.dll and/or libmysql.dll cannot be found by the system.

22.10.1.1.2.2.3. PHP 5.3.0+

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Please refer to these notes on installing MySQL support on PHP 5.3.0 and above.

22.10.1.1.2.3. MySQL Installation Notes

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Warning

Crashes and startup problems of PHP may be encountered when loading this extension in conjunction with the recode extension. See the recode extension for more information.

Note

If you need charsets other than latin (default), you have to install external (not bundled) libmysql with compiled charset support.

22.10.1.1.3. Runtime Configuration

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

Table 22.5. MySQL Configuration Options

NameDefaultChangeableChangelog
mysql.allow_persistent"1"PHP_INI_SYSTEM 
mysql.max_persistent"-1"PHP_INI_SYSTEM 
mysql.max_links"-1"PHP_INI_SYSTEM 
mysql.trace_mode"0"PHP_INI_ALLAvailable since PHP 4.3.0.
mysql.default_portNULLPHP_INI_ALL 
mysql.default_socketNULLPHP_INI_ALLAvailable since PHP 4.0.1.
mysql.default_hostNULLPHP_INI_ALL 
mysql.default_userNULLPHP_INI_ALL 
mysql.default_passwordNULLPHP_INI_ALL 
mysql.connect_timeout"60"PHP_INI_ALLPHP_INI_SYSTEM in PHP <= 4.3.2. Available since PHP 4.3.0.

For further details and definitions of the PHP_INI_* modes, see the configuration.changes.modes.

Here's a short explanation of the configuration directives.

mysql.allow_persistent boolean

Whether to allow persistent connections to MySQL.

mysql.max_persistent integer

The maximum number of persistent MySQL connections per process.

mysql.max_links integer

The maximum number of MySQL connections per process, including persistent connections.

mysql.trace_mode boolean

Trace mode. When mysql.trace_mode is enabled, warnings for table/index scans, non free result sets, and SQL-Errors will be displayed. (Introduced in PHP 4.3.0)

mysql.default_port string

The default TCP port number to use when connecting to the database server if no other port is specified. If no default is specified, the port will be obtained from the MYSQL_TCP_PORT environment variable, the mysql-tcp entry in /etc/services or the compile-time MYSQL_PORT constant, in that order. Win32 will only use the MYSQL_PORT constant.

mysql.default_socket string

The default socket name to use when connecting to a local database server if no other socket name is specified.

mysql.default_host string

The default server host to use when connecting to the database server if no other host is specified. Doesn't apply in SQL safe mode.

mysql.default_user string

The default user name to use when connecting to the database server if no other name is specified. Doesn't apply in SQL safe mode.

mysql.default_password string

The default password to use when connecting to the database server if no other password is specified. Doesn't apply in SQL safe mode.

mysql.connect_timeout integer

Connect timeout in seconds. On Linux this timeout is also used for waiting for the first answer from the server.

22.10.1.1.4. Resource Types

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There are two resource types used in the MySQL module. The first one is the link identifier for a database connection, the second a resource which holds the result of a query.

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