深入浅出讲解：php的socket通信原理

<?php
//确保在连接客户端时不会超时
set_time_limit(0);
 
$ip = &#39;127.0.0.1&#39;;
$port = 1935;
 
/*
 +-------------------------------
 *  @socket通信整个过程
 +-------------------------------
 *  @socket_create
 *  @socket_bind
 *  @socket_listen
 *  @socket_accept
 *  @socket_read
 *  @socket_write
 *  @socket_close
 +--------------------------------
 */
 
/*----------------  以下操作都是手册上的  -------------------*/
if(($sock = socket_create(AF_INET,SOCK_STREAM,SOL_TCP)) < 0) {
  echo "socket_create() 失败的原因是:".socket_strerror($sock)."\n";
}
 
if(($ret = socket_bind($sock,$ip,$port)) < 0) {
  echo "socket_bind() 失败的原因是:".socket_strerror($ret)."\n";
}
 
if(($ret = socket_listen($sock,4)) < 0) {
  echo "socket_listen() 失败的原因是:".socket_strerror($ret)."\n";
}
 
$count = 0;
 
do {
  if (($msgsock = socket_accept($sock)) < 0) {
    echo "socket_accept() failed: reason: " . socket_strerror($msgsock) . "\n";
    break;
  } else {
     
    //发到客户端
    $msg ="测试成功！\n";
    socket_write($msgsock, $msg, strlen($msg));
     
    echo "测试成功了啊\n";
    $buf = socket_read($msgsock,8192);
     
     
    $talkback = "收到的信息:$buf\n";
    echo $talkback;
     
    if(++$count >= 5){
      break;
    };
     
   
  }
  //echo $buf;
  socket_close($msgsock);
 
} while (true);
 
socket_close($sock);
?>

<?php
error_reporting(E_ALL);
set_time_limit(0);
echo "<h2>TCP/IP Connection</h2>\n";
 
$port = 1935;
$ip = "127.0.0.1";
 
/*
 +-------------------------------
 *  @socket连接整个过程
 +-------------------------------
 *  @socket_create
 *  @socket_connect
 *  @socket_write
 *  @socket_read
 *  @socket_close
 +--------------------------------
 */
 
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
if ($socket < 0) {
  echo "socket_create() failed: reason: " . socket_strerror($socket) . "\n";
}else {
  echo "OK.\n";
}
 
echo "试图连接 &#39;$ip&#39; 端口 &#39;$port&#39;...\n";
$result = socket_connect($socket, $ip, $port);
if ($result < 0) {
  echo "socket_connect() failed.\nReason: ($result) " . socket_strerror($result) . "\n";
}else {
  echo "连接OK\n";
}
 
$in = "Ho\r\n";
$in .= "first blood\r\n";
$out = &#39;&#39;;
 
if(!socket_write($socket, $in, strlen($in))) {
  echo "socket_write() failed: reason: " . socket_strerror($socket) . "\n";
}else {
  echo "发送到服务器信息成功！\n";
  echo "发送的内容为:<font color=&#39;red&#39;>$in</font> <br>";
}
 
while($out = socket_read($socket, 8192)) {
  echo "接收服务器回传信息成功！\n";
  echo "接受的内容为:",$out;
}
 
 
echo "关闭SOCKET...\n";
socket_close($socket);
echo "关闭OK\n";
?>

// 设置一些基本的变量
$host = "192.168.1.99";
$port = 1234;
// 设置超时时间
set_time_limit(0);
// 创建一个Socket
$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not createsocket\n");
//绑定Socket到端口
$result = socket_bind($socket, $host, $port) or die("Could not bind tosocket\n");
// 开始监听链接
$result = socket_listen($socket, 3) or die("Could not set up socketlistener\n");
// accept incoming connections
// 另一个Socket来处理通信
$spawn = socket_accept($socket) or die("Could not accept incomingconnection\n");
// 获得客户端的输入
$input = socket_read($spawn, 1024) or die("Could not read input\n");
// 清空输入字符串
$input = trim($input);
//处理客户端输入并返回结果
$output = strrev($input) . "\n";
socket_write($spawn, $output, strlen ($output)) or die("Could not write
output\n");
// 关闭sockets
socket_close($spawn);
socket_close($socket);

// 设置两个变量
$host = "192.168.1.99";
$port = 1234;

// 超时时间
set_time_limit(0);

// 创建Socket
$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create
socket\n");

// 创建 socket
$socket = socket_create(AF_INET, SOCK_DGRAM, 0) or die("Could not create
socket\n");

// 绑定 socket to 指定地址和端口
$result = socket_bind($socket, $host, $port) or die("Could not bind to
socket\n");

// 开始监听连接
$result = socket_listen($socket, 3) or die("Could not set up socket
listener\n");

//接受请求链接
// 调用子socket 处理信息
$spawn = socket_accept($socket) or die("Could not accept incoming
connection\n");

// 读取客户端输入
$input = socket_read($spawn, 1024) or die("Could not read input\n");

// 处理客户端输入并返回数据
$output = strrev($input) . "\n";
socket_write($spawn, $output, strlen ($output)) or die("Could not write
output\n");

// 关闭 sockets
socket_close($spawn);
socket_close($socket);