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# mysql_pconnect

(PHP 3 <= 3.0.18, PHP 4 >= 4.0.0)

mysql_pconnect -- Open a persistent connection to a MySQL server

## Description

``resource mysql_pconnect` (string [server] [, string username [, string password]])`

Returns a positive MySQL persistent link identifier on success, or `FALSE` on error.

mysql_pconnect() establishes a connection to a MySQL server. The following defaults are assumed for missing optional parameters: `server` = 'localhost:3306', `username` = name of the user that owns the server process and `password` = empty password.

The `server` parameter can also include a port number. eg. "hostname:port" or a path to a socket eg. ":/path/to/socket" for the localhost.

> Note: Support for ":port" was added in 3.0B4.

> Support for the ":/path/to/socket" was added in 3.0.10.

mysql_pconnect() acts very much like mysql_connect() with two major differences.

First, when connecting, the function would first try to find a (persistent) link that's already open with the same host, username and password. If one is found, an identifier for it will be returned instead of opening a new connection.

Second, the connection to the SQL server will not be closed when the execution of the script ends. Instead, the link will remain open for future use (mysql_close() will not close links established by mysql_pconnect()).

This type of links is therefore called 'persistent'.

> Note: Note, that these kind of links only work if you are using a module version of PHP. See the Persistent Database Connections section for more information.

Warning
Using persistent connections can require a bit of tuning of your Apache and MySQL configurations to ensure that you do not exceed the number of connections allowed by MySQL.

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