static string Worker::$stdoutFile

This attribute is a global static attribute. If running in daemon mode (started with -d), all output to the terminal (such as echo, var_dump, etc.) will be redirected to the file specified by stdoutFile.

If not set and running in daemon mode, all terminal output will be redirected to /dev/null (which means discarding all output by default).

Note: /dev/null is a special file in Linux, which is actually a black hole, and all data written to this file will be discarded. If you don't want to discard the output, you can set Worker::$stdoutFile to a normal file path.

Note: This attribute must be set before Worker::runAll(); is called to take effect. This feature is not supported in Windows systems.


use Workerman\Worker;
require_once __DIR__ . '/vendor/autoload.php';

Worker::$daemonize = true;
// All printed output is saved in the /tmp/stdout.log file
Worker::$stdoutFile = '/tmp/stdout.log';
$worker = new Worker('text://');
$worker->onWorkerStart = function($worker)
    echo "Worker start\n";
// Run worker