(PECL libevent >= 0.0.4)
event_buffer_set_callback — Set or reset callbacks for a buffered event
$event
, mixed $readcb
, mixed $writecb
, mixed $errorcb
[, mixed $arg
] )
Sets or changes existing callbacks for the buffered event.
event
Valid buffered event resource.
readcb
Callback to invoke where there is data to read, or NULL if no callback is desired.
writecb
Callback to invoke where the descriptor is ready for writing, or NULL if no callback is desired.
errorcb
Callback to invoke where there is an error on the descriptor, cannot be NULL.
arg
An argument that will be passed to each of the callbacks (optional).
成功时返回 TRUE， 或者在失败时返回 FALSE。