用PHP的Socket建立自己的聊天室服务器

/**
* 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 t

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