php socket实现的聊天室代码分享

/**
* patserver
* php socket server base class
* events that can be handled:
*  * onstart
*  * onconnect
*  * onconnectionrefused
*  * onclose
*  * onshutdown
*  * onreceivedata
*
* @version 1.1
* @author  stephan schmidt <schst@php-tools.de>
* @package patserver
*/
class patserver {
/**
* information about the project
* @var array $systemvars
*/
var $systemvars  = array(
  "appname"  => "patserver",
  "appversion"  => "1.1",
  "author"  => array("stephan schmidt <schst@php-tools.de>", )
  );

/**
* port to listen
* @var integer  $port
*/
  var $port  = 10000;

/**
* domain to bind to
* @var string $domain
*/
  var $domain  = "localhost";

/**
* maximum amount of clients
* @var integer $maxclients
*/
  var $maxclients = -1;

/**
* buffer size for socket_read
* @var integer $readbuffersize
*/
  var $readbuffersize  = 128;

/**
* end character for socket_read
* @var integer $readendcharacter
*/
  var $readendcharacter = "n";

/**
* maximum of backlog in queue
* @var integer $maxqueue
*/
  var $maxqueue = 500;

/**
* debug mode
* @var boolean $debug
*/
  var $debug  = true;

/**
* debug mode
* @var string $debugmode
*/
  var $debugmode = "text";

/**
* debug destination (filename or stdout)
* @var string $debugdest
*/
  var $debugdest = "stdout";

/**
* empty array, used for socket_select
* @var array $null
*/
  var $null  = array();

/**
* all file descriptors are stored here
* @var array $clientfd
*/
  var $clientfd = array();

/**
* needed to store client information
* @var array $clientinfo
*/
  var $clientinfo = array();

/**
* needed to store server information
* @var array $serverinfo
*/
  var $serverinfo = array();

/**
* amount of clients
* @var integer  $clients
*/
  var $clients = 0;

/**
* create a new socket server
*
* @access public
* @param string  $domain  domain to bind to
* @param integer  $port  port to listen to
*/
function patserver( $domain = "localhost", $port = 10000 )
{
  $this->domain = $domain;
  $this->port  = $port;

  $this->serverinfo["domain"]     = $domain;
  $this->serverinfo["port"]     = $port;
  $this->serverinfo["servername"]   = $this->systemvars["appname"];
  $this->serverinfo["serverversion"] = $this->systemvars["appversion"];

  set_time_limit( 0 );
}

/**
* set maximum amount of simultaneous connections
*
* @access public
* @param int $maxclients
*/
function setmaxclients( $maxclients )
{
  $this->maxclients = $maxclients;
}

/**
* set debug mode
*
* @access public
* @param mixed $debug [text|htmlfalse]
* @param string $dest destination of debug message (stdout to output or filename if log should be written)
*/
function setdebugmode( $debug, $dest = "stdout" )
{
  if( $debug === false )
  {
  $this->debug = false;
  return true;
  }

  $this->debug  = true;
  $this->debugmode = $debug;
  $this->debugdest = $dest;
}

/**
* start the server
*
* @access public
* @param int $maxclients
*/
function start()
{
  $this->initfd = @socket_create( af_inet, sock_stream, 0 );
  if( !$this->initfd )
  die( "patserver: could not create socket." );

  // adress may be reused
  socket_setopt( $this->initfd, sol_socket, so_reuseaddr, 1 );

  // bind the socket
  if( !@socket_bind( $this->initfd, $this->domain, $this->port ) )
  {
  @socket_close( $this->initfd );
  die( "patserver: could not bind socket to ".$this->domain." on port ".$this->port." ( ".$this->getlastsocketerror( $this->initfd )." )." );
  }

  // listen on selected port
  if( !@socket_listen( $this->initfd, $this->maxqueue ) )
  die( "patserver: could not listen ( ".$this->getlastsocketerror( $this->initfd )." )." );

  $this->senddebugmessage( "listening on port ".$this->port.". server started at ".date( "h:i:s", time() ) );

  // this allows the shutdown function to check whether the server is already shut down
  $globals["_patserverstatus"] = "running";
  // this ensures that the server will be sutdown correctly
  register_shutdown_function( array( $this, "shutdown" ) );

  if( method_exists( $this, "onstart" ) )
  $this->onstart();

  $this->serverinfo["started"] = time();
  $this->serverinfo["status"]  = "running";

  while( true )
  {
  $readfds = array();
  array_push( $readfds, $this->initfd );

  // fetch all clients that are awaiting connections
  for( $i = 0; $i < count( $this->clientfd ); $i++ )
   if( isset( $this->clientfd[$i] ) )
   array_push( $readfds, $this->clientfd[$i] );

  // block and wait for data or new connection
  $ready = @socket_select( $readfds, $this->null, $this->null, null );

  if( $ready === false )
  {
   $this->senddebugmessage( "socket_select failed." );
   $this->shutdown();
  }

  // check for new connection
  if( in_array( $this->initfd, $readfds ) )
  {
   $newclient = $this->acceptconnection( $this->initfd );

   // check for maximum amount of connections
   if( $this->maxclients > 0 )
   {
   if( $this->clients > $this->maxclients )
   {
    $this->senddebugmessage( "too many connections." );

    if( method_exists( $this, "onconnectionrefused" ) )
    $this->onconnectionrefused( $newclient );

    $this->closeconnection( $newclient );
   }
   }

   if( --$ready <= 0 )
   continue;
  }

  // check all clients for incoming data
  for( $i = 0; $i < count( $this->clientfd ); $i++ )
  {
   if( !isset( $this->clientfd[$i] ) )
   continue;

   if( in_array( $this->clientfd[$i], $readfds ) )
   {
   $data = $this->readfromsocket( $i );

   // empty data => connection was closed
   if( !$data )
   {
    $this->senddebugmessage( "connection closed by peer" );
    $this->closeconnection( $i );
   }
   else
   {
    $this->senddebugmessage( "received ".trim( $data )." from ".$i );

    if( method_exists( $this, "onreceivedata" ) )
    $this->onreceivedata( $i, $data );
   }
   }
  }
  }
}

/**
* read from a socket
*
* @access private
* @param integer $clientid internal id of the client to read from
* @return string $data  data that was read
*/
function readfromsocket( $clientid )
{
  // start with empty string
  $data  = "";

  // read data from socket
  while( $buf = socket_read( $this->clientfd[$clientid], $this->readbuffersize ) )
  {
  $data .= $buf;

  $endstring = substr( $buf, - strlen( $this->readendcharacter ) );
  if( $endstring == $this->readendcharacter )
   break;
  if( $buf == null )
   break;
  }

  if( $buf === false )
  $this->senddebugmessage( "could not read from client ".$clientid." ( ".$this->getlastsocketerror( $this->clientfd[$clientid] )." )." );

  return $data;
}

/**
* accept a new connection
*
* @access public
* @param resource &$socket socket that received the new connection
* @return int  $clientid internal id of the client
*/
function acceptconnection( &$socket )
{
  for( $i = 0 ; $i <= count( $this->clientfd ); $i++ )
  {
  if( !isset( $this->clientfd[$i] ) || $this->clientfd[$i] == null )
  {
   $this->clientfd[$i] = socket_accept( $socket );
   socket_setopt( $this->clientfd[$i], sol_socket, so_reuseaddr, 1 );
   $peer_host = "";
   $peer_port = "";
   socket_getpeername( $this->clientfd[$i], $peer_host, $peer_port );
   $this->clientinfo[$i] = array(
       "host"  => $peer_host,
       "port"  => $peer_port,
       "connecton" => time()
       );
   $this->clients++;

   $this->senddebugmessage( "new connection ( ".$i." ) from ".$peer_host." on port ".$peer_port );

   if( method_exists( $this, "onconnect" ) )
   $this->onconnect( $i );
   return $i;
  }
  }
}

/**
* check, whether a client is still connected
*
* @access public
* @param integer $id client id
* @return boolean $connected true if client is connected, false otherwise
*/
function isconnected( $id )
{
  if( !isset( $this->clientfd[$id] ) )
  return false;
  return true;
}

/**
* close connection to a client
*
* @access public
* @param int $clientid internal id of the client
*/
function closeconnection( $id )
{
  if( !isset( $this->clientfd[$id] ) )
  return false;

  if( method_exists( $this, "onclose" ) )
  $this->onclose( $id );

  $this->senddebugmessage( "closed connection ( ".$id." ) from ".$this->clientinfo[$id]["host"]." on port ".$this->clientinfo[$id]["port"] );

  @socket_close( $this->clientfd[$id] );
  $this->clientfd[$id] = null;
  unset( $this->clientinfo[$id] );
  $this->clients--;
}

/**
* shutdown server
*
* @access public
*/
function shutdown()
{
  if( $globals["_patserverstatus"] != "running" )
  exit;
  $globals["_patserverstatus"] = "stopped";

  if( method_exists( $this, "onshutdown" ) )
  $this->onshutdown();

  $maxfd = count( $this->clientfd );
  for( $i = 0; $i < $maxfd; $i++ )
  $this->closeconnection( $i );

  @socket_close( $this->initfd );

  $this->senddebugmessage( "shutdown server." );
  exit;
}

/**
* get current amount of clients
*
* @access public
* @return int $clients amount of clients
*/
function getclients()
{
  return $this->clients;
}

/**
* send data to a client
*
* @access public
* @param int  $clientid id of the client
* @param string $data  data to send
* @param boolean $debugdata flag to indicate whether data that is written to socket should also be sent as debug message
*/
function senddata( $clientid, $data, $debugdata = true )
{
  if( !isset( $this->clientfd[$clientid] ) || $this->clientfd[$clientid] == null )
  return false;

  if( $debugdata )
  $this->senddebugmessage( "sending: "" . $data . "" to: $clientid" );

  if( !@socket_write( $this->clientfd[$clientid], $data ) )
  $this->senddebugmessage( "could not write '".$data."' client ".$clientid." ( ".$this->getlastsocketerror( $this->clientfd[$clientid] )." )." );
}

/**
* send data to all clients
*
* @access public
* @param string $data  data to send
* @param array $exclude client ids to exclude
*/
function broadcastdata( $data, $exclude = array(), $debugdata = true )
{
  if( !empty( $exclude ) && !is_array( $exclude ) )
  $exclude = array( $exclude );

  for( $i = 0; $i < count( $this->clientfd ); $i++ )
  {
  if( isset( $this->clientfd[$i] ) && $this->clientfd[$i] != null && !in_array( $i, $exclude ) )
  {
   if( $debugdata )
   $this->senddebugmessage( "sending: "" . $data . "" to: $i" );

   if( !@socket_write( $this->clientfd[$i], $data ) )
   $this->senddebugmessage( "could not write '".$data."' client ".$i." ( ".$this->getlastsocketerror( $this->clientfd[$i] )." )." );
  }
  }
}

/**
* get current information about a client
*
* @access public
* @param int  $clientid id of the client
* @return array $info  information about the client
*/
function getclientinfo( $clientid )
{
  if( !isset( $this->clientfd[$clientid] ) || $this->clientfd[$clientid] == null )
  return false;
  return $this->clientinfo[$clientid];
}

/**
* send a debug message
*
* @access private
* @param string $msg message to debug
*/
function senddebugmessage( $msg )
{
  if( !$this->debug )
  return false;

  $msg = date( "y-m-d h:i:s", time() ) . " " . $msg;

  switch( $this->debugmode )
  {
  case "text":
   $msg = $msg."n";
   break;
  case "html":
   $msg = htmlspecialchars( $msg ) . "<br />n";
   break;
  }

  if( $this->debugdest == "stdout" || empty( $this->debugdest ) )
  {
  echo $msg;
  flush();
  return true;
  }

  error_log( $msg, 3, $this->debugdest );
  return true;
}

/**
* return string for last socket error
*
* @access public
* @return string $error last error
*/
function getlastsocketerror( &$fd )
{
  $lasterror = socket_last_error( $fd );
  return "msg: " . socket_strerror( $lasterror ) . " / code: ".$lasterror;
}
function onreceivedata($ip,$data){

  $this->broadcastdata( $data,array(), true );
}
}


$patserver = new patserver();
$patserver->start();