(PECL libevent >= 0.0.5)
event_priority_set — Assign a priority to an event
bool event_priority_set ( resource $event , int $priority )
Assign a priority to the event.
event
Valid event resource.
priority
Priority level. Cannot be less than zero and cannot exceed maximum priority level of the event base (see event_base_priority_init()).
Returns TRUE on success or FALSE on failure.
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https://secure.php.net/manual/en/function.event-priority-set.php