用PHP的Socket建立自己的聊天室服务器

<?PHP
/**
* 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 = " ";

/**
* 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++ ){<