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                # Coroutine\\Socket->sendto [TOC] 向指定的地址和端口發送數據。用于`SOCK_DGRAM`類型的`socket`。 ~~~ Coroutine\Socket->sendto(string $address, int $port, string $data) : int | false; ~~~ 此方法沒有協程調度,底層會立即調用`sendto`向目標主機發送數據。此方法不會監聽可寫,`sendto`可能會因為緩存區已滿而返會`false`,需要自行處理。或者使用`send`方法 ## 參數 * `$address`:目標主機的`IP`地址或`UnixSocket`路徑,`sendto`不支持域名,使用`AF_INET`或`AF_INET6`時,必須傳入合法的`IP`地址,否則發送會返回失敗 * `$port`:目標主機的端口,發送廣播時可以為`0` * `$data`:發送的數據,可以為文本或二進制內容,請注意`SOCK_DGRAM`發送包的最大長度為`64K` ## 返回值 * 發送成功返回發送的字節數 * 發送失敗返回`false`,并設置`errCode`屬性 ## 實例 ~~~ $socket = new Co\Socket(AF_INET, SOCK_DGRAM, 0); $socket->sendto('127.0.0.1', 9601, "HELO"); ~~~
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