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                swoole還提供了直接操作底層epoll/kqueue事件循環的接口。可將其他擴展創建的socket,PHP代碼中stream/socket擴展創建的socket等加入到Swoole的[EventLoop](https://wiki.swoole.com/wiki/page/242.html)中。 swoole_event_add函數用于將一個socket加入到swoole的reactor事件監聽中。 函數原型: ``` bool swoole_event_add(int $sock, mixed $read_callback, mixed $write_callback = null, int `$flags` = null); ``` - `$sock`支持文件描述符、stream資源、sockets資源。 - `$read_callback`為可讀回調函數。 - `$write_callback`為可寫事件回調。 - `$flags`為事件類型的掩碼,可選擇關閉/開啟可讀可寫事件,如`SWOOLE_EVENT_READ`,`SWOOLE_EVENT_WRITE`,或者`SWOOLE_EVENT_READ | SWOOLE_EVENT_WRITE`。 在Server程序中使用,可以理解為在worker/taskworker進程中將此socket注冊到epoll事件中。 在Client程序中使用,可以理解為在客戶端進程中將此socket注冊到epoll事件中。 示例: ``` php <?php $fp = stream_socket_client("tcp://www.52fhy.com:80", $errno, $errstr, 30); fwrite($fp, "GET / HTTP/1.1\r\nHost: www.52fhy.com\r\n\r\n"); swoole_event_add($fp, function($fp) { echo $resp = fread($fp, 1024); //socket處理完成后,從epoll事件中移除socket swoole_event_del($fp); fclose($fp); }); echo "Finish\n"; //swoole_event_add不會阻塞進程,這行代碼會順序執行 ``` 對比一下,下面這個會阻塞進程: ``` <?php $fp = stream_socket_client ( "tcp://www.52fhy.com:80" , $errno , $errstr , 30 ); if (! $fp ) { echo " $errstr ( $errno )<br />\n" ; } else { fwrite ( $fp , "GET / HTTP/1.1\r\nHost: www.52fhy.com\r\n\r\n" ); while (! feof ( $fp )) { echo fgets ( $fp , 1024 ); } fclose ( $fp ); } echo "Finish\n"; ```
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