PHP的Socket网络编程入门指引

  <?php 
   
  // 接受客户端请求，回复固定的响应内容 
  function server_listen_socket ($address, $port) 
  { 
    $buffer = "Msg from wangzhengyi server, so kubi..."; 
    $len = strlen($buffer); 
     
    // create, bind and listen to socket 
    $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); 
    if (! $socket) { 
      echo "failed to create socket:" . socket_strerror($socket) . "\n"; 
      exit(); 
    } 
     
    $bind_flag = socket_bind($socket, $address, $port); 
    if (! $bind_flag) { 
      echo "failed to bind socket:" . socket_strerror($bind_flag) . "\n"; 
      exit(); 
    } 
     
    $backlog = 20; 
    $listen_flag = socket_listen($socket, $backlog); 
    if (! $listen_flag) { 
      echo "failed to listen to socket:" . socket_strerror($listen_flag) . "\n"; 
      exit(); 
    } 
     
    echo "waiting for clients to connect\n"; 
     
    while (1) { 
      if (($aept_socket = socket_aept($socket)) == FALSE) { 
        continue; 
      } else { 
        socket_write($aept_socket, $buffer, $len); 
        socket_close($aept_socket); 
      } 
    } 
  } 
   
  function run_server () 
  { 
    $pid1 = ptl_fork(); 
    if ($pid1 == 0) { 
      // first child process 
       
      // 守护进程的一般流程fork()->setsid()->fork() 
      posix_setsid(); 
       
      if (($pid2 = ptl_fork()) == 0) { 
        $address = "192.168.1.71"; 
        $port = "8767"; 
        server_listen_socket($address, $port); 
      } else { 
        // 防止获得控制终端 
        exit(); 
      } 
    } else { 
      // wait for first child process exit 
      ptl_wait($status); 
    } 
  } 
   
  // server守护进程 
  run_server();