$priority argument should be declared as float, because function expects float value in range between 0 and 1.
Otherwise you get "Unable to set event priority" error.
(PECL event >= 1.2.6-beta)
Event::setPriority — Set event priority
$priority
) : boolSet event priority.
priority
The event priority.
Returns true on success. Otherwise false.
$priority argument should be declared as float, because function expects float value in range between 0 and 1.
Otherwise you get "Unable to set event priority" error.