Process\Pool->write

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);