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php怎么实现聊天功能

php怎么实现聊天功能

1、在前端使用Ajax定时轮询访问php脚本，php再进行查询聊天数据进行返回给前端，最后前端将其进行渲染；

代码示例：

<html>
<head>
<title>聊天室</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="jquery.min.js"></script>
<script>
$(function(){
    $("#post").click(function(){
   
    var content=$("#content").val();
    if(!$.trim(content)){
  alert('请填写内容');
  return false;
    }
    $("#content").val("");

    $.post("ajax.php", {content:content});});
})
    
    function getData(msg){
   if(msg == undefined)
   {
  msg = '';    
   }
   $.post("get.php",{"msg":msg},function(data){
  //var myjson = eval("("+data+")");
  if(data){
 var chatcontent = '';
 var obj = eval('('+data+')');
 $.each(obj,function(key,val){
chatcontent += "<div class='username'>"+val['username']+" 说:</div>";
chatcontent += "<div class='content'>"+val['content']+"</div>";
 })
 $("#chatshow").html(chatcontent);
  }
  
  getData();    
   })    
    }
    
    // function getUser(msg){
    //if(msg == undefined){
    //    msg = '';    
    //}
    //$.post("getuser.php",{"msg":msg},function(data){
    //    //var myjson = eval("("+data+")");
    //    if(data){
    //   var chatcontent = '';
    //   var obj = eval('('+data+')');
    //   $.each(obj,function(key,val){
    //  chatcontent += "<div class='username'>"+val['username']+" 说:</div>";
    //  chatcontent += "<div class='content'>"+val['content']+"</div>";
    //   })
    //   $("#chatshow").html(chatcontent);
    //    }
    //    getData();    
    //})    
    // }
    
    getData("one");
    
    

    // $(function(){
    //$("#userlist p").click(function(){
    //    $("#content").val("@"+$(this).text()+" ");    
    //})    
    // })
    
    // $(function(){
    //$(document).keypress(function(e){
    //    if(e.ctrlKey && e.which == 13 || e.which == 10) { 
    
    //   var content=$("#content").val();
    //   if(!$.trim(content)){
    // alert('请填写内容');
    // return false;
    //   }
    //   $("#content").val("");    
    //   $.post("ajax.php", {content:content});
    //    } 
    //})
    ////alert(event.clientX+document.body.clientWidth);
    // })
    
    /*window.onbeforeunload=function (){ 
   //return("===onbeforeunload==="); 
   if(event.clientX>document.body.clientWidth && event.clientY < 0 || event.altKey){ 
  return("你关闭了浏览器"); 
   }else{ 
  return(document.body.clientWidth); 
   } 
    } */
    
</script>
<style>
#chat{margin:0 auto;}
#chatshow{width:500px;height:400px;overflow:auto;border:1px solid #ccc;float:left;}
#userlist{width:100px;height:400px;overflow:auto;border:1px solid #ccc;float:left;margin-right:2px;}
#userlist p{color:#0F0; cursor:pointer;}
.clearboth{clear:both;}
.username{font-weight:bold;color:#00F;font-size:12px;margin-bottom:3px;margin-top:8px;}
</style>
</head>
<body>
<div id="chat">
<div id="userlist">
<div style="font-size:12px;font-weight:bold;">在线用户列表</div>
<div class="userlist">
<?php 
    // $dsn = "mysql:host=localhost;dbname=test;charset=utf8'";
 //    $db = new PDO($dsn, 'root', 'root');
    $db = new PDO('mysql:dbname=test;host=127.0.0.1;charset=utf8', 'root', 'adminroot');
    $rs = $db->prepare("select * from chat where is_login = '1'");
    $rs->execute();
    while($row = $rs->fetch()){
   echo '<p>'.$row['username'].'</p>';    
    }
?>
</div>
</div>
<div id="chatshow"></div>
</div>
<div class="clearboth"></div>
<div>
<textarea name="content" id="content" style="width:600px;height:100px"></textarea>
<input type='button' name='tj' id="post" value='发布' >
</div>
</body>
</html>
<?php
/*session_start();
$mem = new Memcache;
$mem->connect("localhost",11211);
if(isset($_POST['content'])){
    $con['username'] = $_SESSION["username"];
    $con['content'] = $_POST["content"];
    
    $data = $mem->get('chat');
    $data[] = $con;
    $mem->set("chat",$data,0,0);    
}
$mem->close();
*/
    if(isset($_POST['content'])){
   session_start();
   $filename = date("Ymd",time()).".txt";
   if(file_exists($filename)){
  $content = file_get_contents($filename);
  $data = json_decode($content,true);   
  $con['username'] = $_SESSION["username"];
  $con['content'] = $_POST["content"];
  $data[] = $con;
  $file = fopen($filename,"w");
  fwrite($file,json_encode($data));
  fclose($file);    
   }else{
  $file = fopen($filename,"w");
  $con['username'] = $_SESSION["username"];
  $con['content'] = $_POST["content"];
  $data[] = $con;
  fwrite($file,json_encode($data));
  fclose($file);    
   }
  
    }



?>
<?php 
/*require 'conn.inc';
function getData(){
    $sql="SELECT count(*) FROM  `talkroom`";
    $res=mysql_query($sql);
    $count = mysql_fetch_row($res);
    
    return $count;    
}
$old = getData();

while(true){
    $new = getData();
    if($new[0]>$old[0]){
   //echo json_encode($new['data']);
   //print_r($new);
   echo '2222222222'.'<br/>';
    }
    //echo '<br />11111111111111111111111111111111111111111111111111111111111111111111';
    usleep(1000);
}
*/
/*set_time_limit(0);
$mem = new Memcache;
$mem->connect("localhost",11211);

$count = count($mem->get("chat"));
$com = true;
//$mem->delete('chat');
if($_POST['msg'] == "one"){
    exit(json_encode($mem->get("chat")));    
}
if($_POST['msg'] == "break"){
    $com = false;    
}
$time1 = time();
while(true){
    if($com){
   $data = $mem->get("chat");
   if(count($data)>$count){
  echo json_encode($data);
  break;
   }
   usleep(300);
    }else{
   break;    
    }
}
$mem->close();*/


set_time_limit(0);
$filename = date("Ymd",time()).".txt";
if(file_exists($filename)){
    $content = file_get_contents($filename);
    $data = json_decode($content,true);   
    $count = count($data);
    // echo $count;die;
    if($_POST['msg'] == "one"){
   exit(json_encode($data));    
    }
    
    while(true){
   
   $contents = file_get_contents($filename);
   $datas = json_decode($contents,true);
   $counts = count($datas);    
   if($counts>$count){
  echo json_encode($datas);
  break;
   }
   usleep(300);
    }
}else{
    $file = fopen($filename,"w");
    $con['username'] = "系统消息";
    $con['content'] = "欢迎来到EPGO聊天室";
    $data[] = $con;
    fwrite($file,json_encode($data));
    fclose($file);
    
    exit(json_encode($data));    
    
}

?>

2、使用WebSocket和服务器进行长连接，来实现聊天功能。

客户端代码：

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>websocket聊天室</title>
    <link href="https://fonts.googleapis.com/css?family=Source+Sans+Pro:400,600" rel="stylesheet">
    <link rel="stylesheet" href="css/reset.min.css">
    <link rel="stylesheet" href="css/style.css">
    <style>
   .message img {
  float: left;
  width: 40px;
  height: 40px;
  margin-right: 12px;
  border-radius: 50%;
   }

   .you {
  margin-left: 60px;
  margin-top: -39px;
   }

   .me-header {
  float: right !important;
  margin-right: 0 !important;
   }

   .me {
  margin-right: 60px;
  margin-top: -39px;
   }

   .active-chat::-webkit-scrollbar, .left::-webkit-scrollbar {
  width: 2px;
   }
    </style>
</head>
<body>

<div>
    <div>
   <div>
  <div style="padding: 20px 29px;height: auto;">
 <div class="" style="font: 400 13.3333px Arial;font-weight: 400;">在线人数：<span id="numbers">0</span> 人
 </div>
  </div>
  <ul>
  </ul>
   </div>
   <div>
  <div><span>Tips: <span>PHP之websocket聊天室</span></span></div>
  <div class="chat active-chat" data-chat="person1"
  style="height: auto;border-width: 0px;padding: 10px;height: 483px; padding: 10px;overflow-y: auto;scrollTop: 100px">
  </div>
  <div>
 <a href="javascript:;" class="write-link attach"></a>
 <input type="text" id="input-value" onkeydown="confirm(event)"/>
 <a href="javascript:;" class="write-link smiley"></a>
 <a href="javascript:;" class="write-link send" onclick="send()"></a>
  </div>
   </div>
    </div>
</div>

<script src="js/index.js"></script>
<script>
    var uname = prompt('请输入用户名', 'user' + uuid(8, 16));
    var avatar = ['bo-jackson.jpg', 'dog.png', 'drake.jpg', 'louis-ck.jpeg', 'michael-jordan.jpg', 'thomas.jpg'];
    if (avatar[Math.round(Math.random() * 10)]) {
   var headerimg = "img/" + avatar[Math.round(Math.random() * 10)];
    } else {
   var headerimg = "img/" + avatar[0];
    }

    // 创建一个 websocket 连接
    var ws = new WebSocket("ws://127.0.0.1:1238");

    // websocket 创建成功事件
    ws.onopen = function () {
   var data = "系统消息：建立连接成功";
   console.log(data);

    };

    // websocket 接收到消息事件
    ws.onmessage = function (e) {
   var data = JSON.parse(e.data);
   switch (data.type) {
  case 'handShake':
 console.log(data.msg);
 //发送用户登录
 var user_info = {'type': 'login', 'msg': uname, 'headerimg': headerimg};
 sendMsg(user_info);
 break;
  case 'login':
 userList(data.user_list);
 systemMessage('系统消息: ' + data.msg + ' 已上线');
 break;
  case 'logout':
 userList(data.user_list);
 if (data.msg.length > 0) {
systemMessage('系统消息: ' + data.msg + ' 已下线');
 }
 break;
  case 'user':
 messageList(data);
 break;
  case 'system':
 systemMessage();
 break;
   }
    }

    // websocket 错误事件
    ws.onerror = function () {
   var data = "系统消息 : 出错了,请退出重试.";
   alert(data);
    };

    function confirm(event) {
   var key_num = event.keyCode;
   if (13 == key_num) {
  send();
   } else {
  return false;
   }
    }

    function systemMessage(msg) {
   var html = `<div>
  <span>` + msg + `</span>
   </div>`;
   var active_chat = document.querySelector('div.active-chat');
   var oldHtml = active_chat.innerHTML;
   active_chat.innerHTML = oldHtml + html;
   active_chat.scrollTop = active_chat.scrollHeight;
    }

    function send() {
   var msg = document.querySelector("input#input-value").value;
   var reg = new RegExp("\r\n", "g");
   msg = msg.replace(reg, "");
   sendMsg({type: "user", msg: msg});
   document.querySelector("input#input-value").value = "";
    }

    function sendMsg(msg) {
   var data = JSON.stringify(msg);
   ws.send(data);
    }

    function userList(user) {
   var html = '';
   for (var i = 0; i < user.length; i++) {
  html += `<li data-chat="person1">
<img src="` + user[i].headerimg + `" alt=""/>
<span>` + user[i].username + `</span>
<span>` + user[i].login_time + `</span>
<span style="color: green;font-size: 7px;">在线</span>
 </li>`;
   }
   document.querySelector('ul.people').innerHTML = html;
   document.querySelector('span#numbers').innerHTML = user.length;
    }

    function messageList(data) {
   if (data.from == uname) {
  var html = `<div>
<img src="` + data.headerimg + `" alt=""/>
<div class="bubble me">` + data.msg + `</div>
 </div>`;
   } else {
  var html = `<div>
<img src="` + data.headerimg + `" alt=""/>
<div class="bubble you">` + data.msg + `</div>
 </div>`;
   }
   var active_chat = document.querySelector('div.active-chat');
   var oldHtml = active_chat.innerHTML;
   active_chat.innerHTML = oldHtml + html;
   active_chat.scrollTop = active_chat.scrollHeight;
    }

    /**
* 生产一个全局唯一ID作为用户名的默认值;
*
* @param len
* @param radix
* @returns {string}
*/
    function uuid(len, radix) {
   var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');
   var uuid = [], i;
   radix = radix || chars.length;

   if (len) {
  for (i = 0; i < len; i++) uuid[i] = chars[0 | Math.random() * radix];
   } else {
  var r;

  uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
  uuid[14] = '4';

  for (i = 0; i < 36; i++) {
 if (!uuid[i]) {
r = 0 | Math.random() * 16;
uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
 }
  }
   }

   return uuid.join('');
    }
</script>
</body>
</html>

服务端代码：

<?php
/**
 * Created by PhpStorm.
 * User: 25754
 * Date: 2019/4/23
 * Time: 14:13
 */

class socketServer
{

    const LISTEN_SOCKET_NUM = 9;
    const LOG_PATH = "./log/";
    private $_ip = "127.0.0.1";
    private $_port = 1238;
    private $_socketPool = array();
    private $_master = null;

    public function __construct()
    {
   $this->initSocket();
    }

    private function initSocket()
    {
   try {
  //创建socket套接字
  $this->_master = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
  // 设置IP和端口重用,在重启服务器后能重新使用此端口;
  socket_set_option($this->_master, SOL_SOCKET, SO_REUSEADDR, 1);
  //绑定地址与端口
  socket_bind($this->_master, $this->_ip, $this->_port);
  //listen函数使用主动连接套接口变为被连接套接口，使得一个进程可以接受其它进程的请求，从而成为一个服务器进程。在TCP服务器编程中listen函数把进程变为一个服务器，并指定相应的套接字变为被动连接,其中的能存储的请求不明的socket数目。
  socket_listen($this->_master, self::LISTEN_SOCKET_NUM);
   } catch (Exception $e) {
  $this->debug(array("code: " . $e->getCode() . ", message: " . $e->getMessage()));
   }
   //将socket保存到socket池中
   $this->_socketPool[0] = array('resource' => $this->_master);
   $pid = getmypid();
   $this->debug(array("server: {$this->_master} started,pid: {$pid}"));
   while (true) {
  try {
 $this->run();
  } catch (Exception $e) {
 $this->debug(array("code: " . $e->getCode() . ", message: " . $e->getMessage()));
  }
   }
    }

    private function run()
    {
   $write = $except = NULL;
   $sockets = array_column($this->_socketPool, 'resource');
   $read_num = socket_select($sockets, $write, $except, NULL);
   if (false === $read_num) {
  $this->debug(array('socket_select_error', $err_code = socket_last_error(), socket_strerror($err_code)));
  return;
   }
   foreach ($sockets as $socket) {
  if ($socket == $this->_master) {
 $client = socket_accept($this->_master);
 if ($client === false) {
$this->debug(['socket_accept_error', $err_code = socket_last_error(), socket_strerror($err_code)]);
continue;
 }
 //连接
 $this->connection($client);
  } else {
 //接受数据
 $bytes = @socket_recv($socket, $buffer, 2048, 0);
 if ($bytes == 0) {
$recv_msg = $this->disconnection($socket);
 } else {
if ($this->_socketPool[(int)$socket]['handShake'] == false) {
    $this->handShake($socket, $buffer);
    continue;
} else {
    $recv_msg = $this->parse($buffer);
}
 }
 $msg = $this->doEvents($socket, $recv_msg);
 echo($msg);
 socket_getpeername ( $socket  , $address ,$port );
 $this->debug(array(
'send_success',
json_encode($recv_msg),
$address,
$port
 ));
 $this->broadcast($msg);
  }
   }
    }

    /**
* 数据广播
* @param $data
*/
    private function broadcast($data)
    {
   foreach ($this->_socketPool as $socket) {
  if ($socket['resource'] == $this->_master) {
 continue;
  }
  socket_write($socket['resource'], $data, strlen($data));
   }
    }

    /**
* 业务处理
* @param $socket
* @param $recv_msg
* @return string
*/
    private function doEvents($socket, $recv_msg)
    {
   //联系我
    }

    /**
* socket握手
* @param $socket
* @param $buffer
* @return bool
*/
    public function handShake($socket, $buffer)
    {
   $acceptKey = $this->encry($buffer);
   $upgrade = "HTTP/1.1 101 Switching Protocols\r\n" .
  "Upgrade: websocket\r\n" .
  "Connection: Upgrade\r\n" .
  "Sec-WebSocket-Accept: " . $acceptKey . "\r\n\r\n";

   // 写入socket
   socket_write($socket, $upgrade, strlen($upgrade));
   // 标记握手已经成功，下次接受数据采用数据帧格式
   $this->_socketPool[(int)$socket]['handShake'] = true;
   socket_getpeername ( $socket  , $address ,$port );
   $this->debug(array(
  'hand_shake_success',
  $socket,
  $address,
  $port
   ));
   //发送消息通知客户端握手成功
   $msg = array('type' => 'handShake', 'msg' => '握手成功');
   $msg = $this->frame(json_encode($msg));
   socket_write($socket, $msg, strlen($msg));
   return true;
    }

    /**
* 帧数据封装
* @param $msg
* @return string
*/
    private function frame($msg)
    {
   $frame = [];
   $frame[0] = '81';
   $len = strlen($msg);
   if ($len < 126) {
  $frame[1] = $len < 16 ? '0' . dechex($len) : dechex($len);
   } else if ($len < 65025) {
  $s = dechex($len);
  $frame[1] = '7e' . str_repeat('0', 4 - strlen($s)) . $s;
   } else {
  $s = dechex($len);
  $frame[1] = '7f' . str_repeat('0', 16 - strlen($s)) . $s;
   }
   $data = '';
   $l = strlen($msg);
   for ($i = 0; $i < $l; $i++) {
  $data .= dechex(ord($msg{$i}));
   }
   $frame[2] = $data;
   $data = implode('', $frame);
   return pack("H*", $data);
    }

    /**
* 接受数据解析
* @param $buffer
* @return mixed
*/
    private function parse($buffer)
    {
   $decoded = '';
   $len = ord($buffer[1]) & 127;
   if ($len === 126) {
  $masks = substr($buffer, 4, 4);
  $data = substr($buffer, 8);
   } else if ($len === 127) {
  $masks = substr($buffer, 10, 4);
  $data = substr($buffer, 14);
   } else {
  $masks = substr($buffer, 2, 4);
  $data = substr($buffer, 6);
   }
   for ($index = 0; $index < strlen($data); $index++) {
  $decoded .= $data[$index] ^ $masks[$index % 4];
   }
   return json_decode($decoded, true);
    }

    // 提取 Sec-WebSocket-Key 信息
    private function getKey($req)
    {
   $key = null;
   if (preg_match("/Sec-WebSocket-Key: (.*)\r\n/", $req, $match)) {
  $key = $match[1];
   }
   return $key;
    }

    //加密 Sec-WebSocket-Key
    private function encry($req)
    {
   $key = $this->getKey($req);
   return base64_encode(sha1($key . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11', true));
    }

    /**
* 连接socket
* @param $client
*/
    public function connection($client)
    {
   socket_getpeername ( $client  , $address ,$port );
   $info = array(
  'resource' => $client,
  'userInfo' => '',
  'handShake' => false,
  'ip' => $address,
  'port' => $port,
   );
   $this->_socketPool[(int)$client] = $info;
   $this->debug(array_merge(['socket_connect'], $info));
    }

    /**
* 断开连接
* @param $socket
* @return array
*/
    public function disconnection($socket)
    {
   $recv_msg = array(
  'type' => 'logout',
  'msg' => @$this->_socketPool[(int)$socket]['username'],
   );
   unset($this->_socketPool[(int)$socket]);
   return $recv_msg;
    }

    /**
* 日志
* @param array $info
*/
    private function debug(array $info)
    {
   $time = date('Y-m-d H:i:s');
   array_unshift($info, $time);
   $info = array_map('json_encode', $info);
   file_put_contents(self::LOG_PATH . 'websocket_debug.log', implode(' | ', $info) . "\r\n", FILE_APPEND);
    }
}

new socketServer();

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