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php怎么实现聊天功能_后端开发

python中type()是什么意思_后端开发

python中type()是一个内建的获取变量类型的函数。【type(object)】,表示返回一个对象的类型,如【In [1]: a = 10 In [2]: type(a) Out[2]: int】。

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:

php运行环境一键搭建_后端开发

php运行环境一键搭建的方法:1、去PHPStudy官网下载最新版的PHPstudy;2、解压安装包并点击进行安装;3、安装完成后进入管理界面并点击【启动】即可开启服务。4、创建网站并测试环境。

<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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