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update : 2015.11.03
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ifx_pconnect(PHP 4, PHP <=5.2.0) ifx_pconnect — Open persistent Informix connection 설명
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'. 인수All 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).
반환값
Returns: valid Informix persistent link identifier on success, or |