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# mysql_pconnect

(PHP 3, PHP 4, PHP 5)

mysql_pconnect -- Open a persistent connection to a MySQL server

## Description

resource mysql_pconnect ( [string server [, string username [, string password [, int client_flags]]]] )

Establishes a persistent connection to a MySQL server.

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 link is therefore called 'persistent'.

## Parameters

server

  The MySQL server. It can also include a port number. e.g. "hostname:port" or a path to a local socket e.g. ":/path/to/socket" for the localhost.

  If the PHP directive mysql.default_host is undefined (default), then the default value is 'localhost:3306'

username

  The username. Default value is the name of the user that owns the server process.

password

  The password. Default value is an empty password.

client_flags

  The client_flags parameter can be a combination of the following constants: `MYSQL_CLIENT_SSL`, `MYSQL_CLIENT_COMPRESS`, `MYSQL_CLIENT_IGNORE_SPACE` or `MYSQL_CLIENT_INTERACTIVE`.

## Return Values

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

## ChangeLog

Version | Description
--- | ---
4.3.0 | Added the client_flags parameter.
3.0.10 | Added support for ":/path/to/socket" with server.
3.0.0 | Added support for ":port" with server.

## Notes

> 注: 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.

警告
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.

> 注: You can suppress the error message on failure by prepending a @ to the function name.

## �Ѧ�

mysql_connect()
Persistent Database Connections

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