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# icap_open

(PHP 4 >= 4.0.0)

icap_open -- Opens up an ICAP connection

## Description

``stream icap_open` (string calendar, string username, string password, string options)`

Returns an ICAP stream on success, `FALSE` on error.

icap_open() opens up an ICAP connection to the specified `calendar` store. If the optional `options` is specified, passes the `options` to that mailbox also.

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