> composer install
Loading composer repositories with package information
Updating dependencies (including require-dev)
  - Installing workerman/workerman (v3.3.7)
    Downloading: 100%

  - Installing workerman/channel (v1.0.3)
    Downloading: 100%

workerman/workerman suggests installing ext-event (For better performance.)
Writing lock file
Generating autoload files

"require": {
    "workerman/workerman" : ">=3.1.8",
    "workerman/channel" : ">=1.0.0",
    "workerman/phpsocket.io" : ">=1.1.1"
}

> composer update

<?php
require_once __DIR__ . '/vendor/autoload.php';
use PHPSocketIO\SocketIO;

// listen port 2021 for socket.io client
$io = new SocketIO(2021);
$io->on('connection', function($socket)use($io){
  $socket->on('chat message', function($msg)use($io){
    $io->emit('chat message from server', $msg);
  });
});

<script src='//cdn.bootcss.com/socket.io/1.3.7/socket.io.js'></script>
<script>
// 连接服务端
var socket = io('http://127.0.0.1:2021');
// 触发服务端的chat message事件
socket.emit('chat message', '这个是消息内容...');
// 服务端通过emit('chat message from server', $msg)触发客户端的chat message from server事件
socket.on('chat message from server', function(msg){
	console.log('get message:' + msg + ' from server');
});
</script>

php server.php start for debug mode

php server.php start -d for daemon mode

php server.php stop

php server.php status

由于walkman依赖PHP的pcntl多进程扩展，所以需要先安装该扩展：

# 进入PHP源码包扩展目录,如果不存在则去官网下载,下载对应版本提取出来 http://php.net/releases/
cd /data/soft/php/php-5.6.3/ext/pcntl
/usr/bin/phpize
./configure --with-php-config=/usr/local/php/bin/php-config
make
make install

# 增加pcntl.so 到 php.ini文件中
vim /usr/local/php/etc/php.ini
extension = pcntl.so

# 重启php-fpm
/etc/init.d/php-fpm restart

另外一种安装的方法
centos
1、命令行运行yum install php-cli php-process git php-devel php-pear libevent-devel
2、命令行运行pecl install channel://pecl.php.net/libevent-0.1.0
3、命令行运行echo extension=libevent.so > /etc/php.d/libevent.ini

debian/ubuntu
1、命令行运行apt-get update && apt-get install php5-cli git php-pear php5-dev libevent-dev
2、命令行运行pecl install channel://pecl.php.net/libevent-0.1.0
3、命令行运行echo extension=libevent.so > /etc/php5/cli/conf.d/libevent.ini

> php -m |grep pcntl
pcntl