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# ifx_pconnect

(PHP 3 >= 3.0.3, PHP 4, PHP 5)

ifx_pconnect -- Open persistent Informix connection

## 说明

resource ifx_pconnect ( [string database [, string userid [, string password]]] )

ifx_pconnect() acts very much like ifx_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 (ifx_close() will not close links established by ifx_pconnect()).

This type of links is therefore called 'persistent'.

## 参数

All of the arguments are optional, and if they're missing, defaults are taken from values supplied in `php.ini` (ifx.default_host for the host (Informix libraries will use `INFORMIXSERVER` environment value if not defined), ifx.default_user for user, ifx.default_password for the password (none if not defined).

`database`

  The database name, as a string.

`userid`

  The username, as a string.

`password`

  The password, as a string.

## 返回值

Returns: valid Informix persistent link identifier on success, or `FALSE` on errors.

## 参见

ifx_connect()

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