【转】网页游戏能用PHP做后端开发吗? PHP Libevent扩展安装及应用
网页游戏能用PHP做后端开发吗?
当然可以。最好走HTTP,也可以做网络编程,而且写代码超简单,1个函数就可以建一个服务器端。stream_socket_server()
多线程不是什么好主意,你可以用php libevent扩展,异步高并发。PHP还有很多网络的扩展包。
PHP的开发效率高,.net Java ,你足够有钱,可以用。
libevent是一个基于事件驱动的高性能网络库。支持多种 I/O 多路复用技术, epoll、 poll、 dev/poll、 select 和 kqueue 等;支持 I/O,定时器和信号等事件;注册事件优先级。
PHP libevent扩展安装:
libevent扩展依赖于原始的libevent库,必须先把libevent库安装。
(1)安装libevent库
- wget http://cloud.github.com/downloads/libevent/libevent/libevent-2.0.20-stable.tar.gz
- tar zxvf libevent-2.0.20-stable.tar.gz
- cd libevent-2.0.20-stable/
- ./configure --prefix=/usr/local/libevent-2.0.20/
- make
- make install
(2)安装libevent扩展(http://pecl.php.net/package/libevent)
- wget http://pecl.php.net/get/libevent-0.1.0.tgz
- tar -zxvf libevent-0.1.0.tgz
- cd libevent-0.1.0
- ./configure --with-php-config=/usr/local/php54/bin/php-config --with-libevent=/usr/local/libevent-2.0.20/
- make && make install
- #php.ini添加extension=libevent.so
- event_base_free() 释放资源,这不能销毁绑定事件
- event_base_loop() 处理事件,根据指定的base来处理事件循环
- event_base_loopbreak() 立即取消事件循环,行为各break语句相同
- event_base_loopexit() 在指定的时间后退出循环
- event_base_new() 创建并且初始事件
- event_base_priority_init() 设定事件的优先级
- event_base_set() 关联事件到事件base
- event_buffer_base_set() 关联缓存的事件到event_base
- event_buffer_disable() 禁用一个缓存的事件
- event_buffer_enable() 启用一个指定的缓存的事件
- event_buffer_fd_set() 改变一个缓存的文件系统描述
- event_buffer_free() 释放缓存事件
- event_buffer_new() 建立一个新的缓存事件
- event_buffer_priority_set() 缓存事件的优先级设定
- event_buffer_read() 读取缓存事件中的数据
- event_buffer_set_callback() 给缓存的事件设置或重置回调hansh函数
- event_buffer_timeout_set() 给一个缓存的事件设定超时的读写时间
- event_buffer_watermark_set 设置读写事件的水印标记
- event_buffer_write() 向缓存事件中写入数据
- event_add() 向指定的设置中添加一个执行事件
- event_del() 从设置的事件中移除事件
- event_free() 清空事件句柄
- event_new() 创建一个新的事件
- event_set() 准备想要在event_add中添加事件
PHP Libevent扩展使用:
例1:5s后触发callback
- $base = event_base_new();
- $event = event_new();
- event_set($event, 0, EV_TIMEOUT, function() {
- echo "function called";
- });
- event_base_set($event, $base);
- event_add($event, 5000000);
- event_base_loop($base);
例2:打印输入流
- function print_line($fd, $events, $arg)
- {
- static $max_requests = 0;
- $max_requests++;
- if ($max_requests == 10) {
- // exit loop after 10 writes
- event_base_loopexit($arg[1]);
- }
- echo fgets($fd);
- }
- // create base and event
- $base = event_base_new();
- $event = event_new();
- $fd = STDIN;
- // set event flags
- event_set($event, $fd, EV_READ | EV_PERSIST, 'print_line', array($event, $base));
- // set event base
- event_base_set($event, $base);
- // enable event
- event_add($event);
- // start event loop
- event_base_loop($base);
例3:实现简单web server
在cli执行后,打开浏览器2000端口试试看。
- $socket = stream_socket_server ('tcp://0.0.0.0:2000', $errno, $errstr);
- stream_set_blocking($socket, 0);
- $base = event_base_new();
- $event = event_new();
- event_set($event, $socket, EV_READ | EV_PERSIST, 'ev_accept', $base);
- event_base_set($event, $base);
- event_add($event);
- event_base_loop($base);
- function ev_accept($socket, $flag, $base)
- {
- $connection = stream_socket_accept($socket);
- stream_set_blocking($connection, 0);
- $buffer = event_buffer_new($connection, 'ev_read', NULL, 'ev_error', $connection);
- event_buffer_base_set($buffer, $base);
- event_buffer_timeout_set($buffer, 30, 30);
- event_buffer_watermark_set($buffer, EV_READ, 0, 0xffffff);
- event_buffer_priority_set($buffer, 10);
- event_buffer_enable($buffer, EV_READ | EV_PERSIST);
- $GLOBALS['_'] = $buffer; //这个buffer一定要赋给个全局的变量 貌似是传值过程中的bug 或者5.3.8的闭包还是有问题?
- }
- function ev_error($buffer, $error, $connection)
- {
- event_buffer_disable($buffer, EV_READ | EV_WRITE);
- event_buffer_free($buffer);
- fclose($connection);
- }
- function ev_read($buffer, $connection)
- {
- while ($read = event_buffer_read($buffer, 256)) {
- }
- fwrite($connection , date('Y-m-d H:i:s'));
- ev_error($buffer , '' , $connection);
- }
参考资料: