# mysql_pconnect

(PHP 4, PHP 5)

mysql_pconnect — Open a persistent connection to a MySQL server

Warning

This extension was deprecated in PHP 5.5.0, and it was removed in PHP 7.0.0. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:

- mysqli_connect() with `p:` host prefix
- PDO::__construct() with `PDO::ATTR_PERSISTENT` as a driver option

### Description

mysql_pconnect ([ string `$server` = ini_get("mysql.default_host") [, string `$username` = ini_get("mysql.default_user") [, string `$password` = ini_get("mysql.default_password") [, int `$client_flags` = 0 ]]]] ) : resource

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: 128 (enable `LOAD DATA LOCAL` handling), `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
--- | ---
5.5.0 | This function will generate an `E_DEPRECATED` error.

### Notes

> 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.

### See Also

- mysql_connect() - Open a connection to a MySQL Server
- Persistent Database Connections