(PECL libevent >= 0.0.1)
event_base_new — Create and initialize new event base
resource event_base_new ( void )
Returns new event base, which can be used later in event_base_set(), event_base_loop() and other functions.
This function has no parameters.
 event_base_new() returns valid event base resource on success or FALSE on error. 
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    https://secure.php.net/manual/en/function.event-base-new.php