Chat room code sharing implemented by php socket, socket chat room

/**
* 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();

Copy after login

Use php socket to create a chat room

Why ask for trouble? The key technology for making chat rooms in PHP is automatic partial page refresh.
Through php ajax technology, you can perfectly meet your requirements.
The specific principle is as follows. In the web chat box, it is called by ajax. Ajax passes parameters to a php page. This page also calls the database and returns the new content in the database to the page chat box.
Then you can adjust the time yourself, whether to access the database once every 20 seconds or every 10 seconds.
As for the socket technology of PHP, to be honest, I have been working with PHP for 8 years and have never touched it.
I think the key is not what technology to use, the key is to solve the problem.
Hope it’s useful to you.

Write the code to create private chat in php chat room

PHP’s support for network communication is not very good. Although PHP’s socket is supported, the concurrency is not good. Let’s use Java’s Mina framework.