socket通信的原理在这里就不说了,它的用途还是比较广泛的,我们可以使用socket来做一个API接口出来,也可以使用socket来实现两个程序之间的通信,我们来研究一下在php里面如何实现socket通信。
由于socket服务端的代码要监听端口,等待接收请求,所以php在做socket服务的时候需要将php文件运行在CMD里面。
如果要使php文件可以在CMD里面运行,则需要进行如下设置:
1.添加环境变量,名字为PHP_HOME,值为php文件安装目录下的.exe文件地址,如D:\wamp\bin\php\php5.5.12\php.exe
2.修改系统变量path的值
在path的值里面添加php安装的目录:如D:\wamp\bin\php\php5.5.12;
好了,到这里我们就配置好了环境变量,下一步我们打开CMD,想要在里面运行php文件,比如aaa.php文件,则我们写上这一句话:
php d:\wamp\www\aaa.php
然后按下回车键,好了,我们的php文件在cmd里面运行了,输出了一句:hello
这样的话php文件能够成功在cmd里面运行,接下来我们来看一下php怎么实现socket通信。
1.php制作的socket服务端
主要功能是设置socket通信的IP地址及端口号,监听端口,有客户端连接的话,接收连接请求接收数据,处理并且返回数据。
代码如下:
//确保在连接客户端时不会超时 set_time_limit(0); //设置IP和端口号 $address = "127.0.0.1"; $port = 2048; //调试的时候,可以多换端口来测试程序! /** * 创建一个SOCKET * AF_INET=是ipv4 如果用ipv6,则参数为 AF_INET6 * SOCK_STREAM为socket的tcp类型,如果是UDP则使用SOCK_DGRAM */ $sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die("socket_create() 失败的原因是:" . socket_strerror(socket_last_error()) . "/n"); //阻塞模式 socket_set_block($sock) or die("socket_set_block() 失败的原因是:" . socket_strerror(socket_last_error()) . "/n"); //绑定到socket端口 $result = socket_bind($sock, $address, $port) or die("socket_bind() 失败的原因是:" . socket_strerror(socket_last_error()) . "/n"); //开始监听 $result = socket_listen($sock, 4) or die("socket_listen() 失败的原因是:" . socket_strerror(socket_last_error()) . "/n"); echo "OK\nBinding the socket on $address:$port ... "; echo "OK\nNow ready to accept connections.\nListening on the socket ... \n"; do { // never stop the daemon //它接收连接请求并调用一个子连接Socket来处理客户端和服务器间的信息 $msgsock = socket_accept($sock) or die("socket_accept() failed: reason: " . socket_strerror(socket_last_error()) . "/n"); //读取客户端数据 echo "Read client data \n"; //socket_read函数会一直读取客户端数据,直到遇见\n,\t或者\0字符.PHP脚本把这写字符看做是输入的结束符. $buf = socket_read($msgsock, 8192); echo "Received msg: $buf \n"; //数据传送 向客户端写入返回结果 $msg = "welcome \n"; socket_write($msgsock, $msg, strlen($msg)) or die("socket_write() failed: reason: " . socket_strerror(socket_last_error()) ."/n"); //一旦输出被返回到客户端,父/子socket都应通过socket_close($msgsock)函数来终止 socket_close($msgsock); } while (true); socket_close($sock);
2.调取socket服务的客户端文件
客户端依然是要设置好要访问服务器的IP地址及端口号(即上一步骤中的IP及端口),完了创建一个socket连接,发送数据到服务器,接收返回数据。
set_time_limit(0); $host = "127.0.0.1"; $port = 2048; $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)or die("Could not create socket\n"); // 创建一个Socket $connection = socket_connect($socket, $host, $port) or die("Could not connet server\n"); // 连接 socket_write($socket, "hello socket") or die("Write failed\n"); // 数据传送 向服务器发送消息 while ($buff = @socket_read($socket, 1024, PHP_NORMAL_READ)) { echo("Response was:" . $buff . "\n"); } socket_close($socket);
3.在cmd里面运行服务端代码
运行成功,已经在监听端口了。。。
4.在网页里面运行我们的客户端网页,来向服务器交互数据
运行起来,浏览器显示:
cmd里面的服务端显示:
这是一个简单的socket通信的测试,至于socket接收到什么数据,怎么处理数据,返回什么类型的数据,还需要使用php来做逻辑了。

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PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

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