(PECL libevent >= 0.0.2)
event_base_priority_init — Set the number of event priority levels
bool event_base_priority_init ( resource $event_base , int $npriorities )
Sets the number of different event priority levels.
By default all events are scheduled with the same priority (npriorities
/2). Using event_base_priority_init() you can change the number of event priority levels and then set a desired priority for each event.
event_base
Valid event base resource.
npriorities
The number of event priority levels.
event_base_priority_init() returns TRUE
on success or FALSE
on error.
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https://secure.php.net/manual/en/function.event-base-priority-init.php