(PECL event >= 1.4.0-beta) Sets a callback for specified URI

(PECL event >= 1.6.0) Sets socket options

(PECL zmq >= 0.5.0) Set a socket option public

(PECL gearman >= 0.5.0) Add a low priority background task to be run in parallel

(PECL memcached >= 0.1.0) Store an item on a specific server

(PHP 4, PHP 5 <= 5.0.5) Fetches the machine's default NIS domain

(PECL svn >= 0.2.0) Create a new transaction

(PECL event >= 1.2.6-beta) Adds a domain to the list of search domains

(PECL sam >= 0.1.0) The header properties of the message.

(PHP 4 >= 4.0.1, PECL yaz >= 0.9.0) Returns error number