PHP Fatal error: Uncaught ErrorException: Undefined variable: ret in /btc/okcoin/vendor/workerman/workerman/Events/Select.php:284

        while (1) {
            if(\DIRECTORY_SEPARATOR === '/') {
                // Calls signal handlers for pending signals
                \pcntl_signal_dispatch();
            }

            $read  = $this->_readFds;
            $write = $this->_writeFds;
            $except = $this->_exceptFds;

            if ($read || $write || $except) {
                // Waiting read/write/signal/timeout events.
                try {
                    $ret = @stream_select($read, $write, $except, 0, $this->_selectTimeout);
                } catch (\Exception $e) {} catch (\Error $e) {}

            } else {
                usleep($this->_selectTimeout);
                $ret = false;
            }

            if (!$this->_scheduler->isEmpty()) {
                $this->tick();
            }

=======>     if (!$ret) {
                continue;
            }

284行代碼:

     if (!$ret) {

這個變量沒有初始化， 當(dāng) try cache 發(fā)生異常時， 變量賦值語句沒執(zhí)行， 就會發(fā)生變量 未定義， 產(chǎn)生語法錯誤了。