用PHP的Socket建立自己的聊天室服务器

     // 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(

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