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                # swoole_event_set 修改事件監聽的回調函數和掩碼。函數原型: ```php bool swoole_event_set($fd, mixed $read_callback, mixed $write_callback, int $flags); ``` 參數與[swoole_event_add](https://wiki.swoole.com/wiki/page/119.html)完全相同。如果傳入`$fd`在`EventLoop`中不存在返回`false`。 * 當·`$read_callback`不為`null`時,將修改可讀事件回調函數為指定的函數 * 當`$write_callback`不為`null`時,將修改可寫事件回調函數為指定的函數 * `$flags`可關閉/開啟,可寫(`SWOOLE_EVENT_READ`)和可讀(`SWOOLE_EVENT_WRITE`)事件的監聽 注意如果監聽了`SWOOLE_EVENT_READ`事件,而當前并未設置`read_callback`,底層會直接返回`false`,添加失敗。`SWOOLE_EVENT_WRITE`同理。 狀態變更 ---- 使用`swoole_event_add`或`swoole_event_set`設置了可讀事件回調,但并未監聽`SWOOLE_EVENT_READ`可讀事件,這時底層僅保存回調函數的信息。并不會產生任何事件回調。 可以使用`swoole_event_set($fd, null, null, SWOOLE_EVENT_READ | SWOOLE_EVENT_WRITE`,修改監聽的事件類型,這時底層會觸發可讀事件。 釋放回調函數 ---- 注意`swoole_event_set`只能替換回調函數,但并不能釋放事件回調函數。如:`swoole_event_set($fd, null, null, SWOOLE_EVENT_READ | SWOOLE_EVENT_WRITE`,參數中傳入的`read_callback`和`write_callback`為`null`,表示不對`swoole_event_add`設置的回調函數進行修改,而不是將事件回調函數設為`null`。 只有調用`swoole_event_del`清除事件監聽時,底層才會釋放`read_callback`和`write_callback`事件回調函數。
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