Process\Pool->write
最后更新于：2022-04-02 06:36:04
# Process\\Pool->write
[TOC]
向对端写入数据，必须在`$ipc_mode`为`SWOOLE_IPC_SOCKET`时才能使用。
~~~
function Process\Pool::write(string $data);
~~~
* `$data`：写入的数据内容。可多次调用`write`，底层会在`onMessage`函数退出后将数据全部写入`socket`中，并`close`连接
* 此方法为内存操作，没有`IO`消耗
* 发送数据操作是同步阻塞`IO`
## 实例
~~~
$pool = new Swoole\Process\Pool(2, SWOOLE_IPC_SOCKET);
$pool->on("Message", function ($pool, $message) {
echo "Message: {$message}\n";
$pool->write("hello ");
$pool->write("world ");
$pool->write("\n");
});
$pool->listen('127.0.0.1', 8089);
$pool->start();
~~~
## 调用端
~~~
$fp = stream_socket_client("tcp://127.0.0.1:8089", $errno, $errstr) or die("error: $errstr\n");
$msg = json_encode(['data' => 'hello', 'uid' => 1991]);
fwrite($fp, pack('N', strlen($msg)) . $msg);
sleep(1);
//将显示 hello world\n
var_dump(fread($fp, 8192));
fclose($fp);
~~~
';