


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();
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.
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.

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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