手冊中寫的是

返回值
返回 $worker_connnections 中的一個連接對象。如果沒有可返回的$worker_connnections，則返回false。

然后我這樣寫return false;

最終報錯了竟然

PHP Fatal error:  Call to a member function send() on boolean in /share/gatewayworker/vendor/workerman/gateway-worker/src/Gateway.php on line 414

Fatal error: Call to a member function send() on boolean in /share/gatewayworker/vendor/workerman/gateway-worker/src/Gateway.php on line 414

Worker[21969] process terminated with ERROR: E_ERROR "Call to a member function send() on boolean in /share/gatewayworker/vendor/workerman/gateway-worker/src/Gateway.php on line 414"

看了源碼好像是沒有對返回的worker_connection錯判斷

$worker_connection = call_user_func($this->router, $this->_workerConnections, $connection, $cmd, $body);
if (false === $worker_connection->send($gateway_data)) {
     $msg = "SendBufferToWorker fail. May be the send buffer are overflow. See http://doc2.workerman.net/send-buffer-overflow.html";
     static::log($msg);
     return false;
}