(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
] ) : bool
Sets or changes existing callbacks for the buffered event.
eventValid buffered event resource.
readcbCallback to invoke where there is data to read, or NULL if no callback is desired.
writecbCallback to invoke where the descriptor is ready for writing, or NULL if no callback is desired.
errorcbCallback to invoke where there is an error on the descriptor, cannot be NULL.
argAn 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。