php模拟长连接

来源：互联网发布：gopro windows 编辑：程序博客网时间：2024/05/21 07:59

例1：循环延迟输出数据

<?phpif (ob_get_level() == 0) ob_start();for ($i = 0; $i<10; $i++){        echo "<br> Line to show.";        echo str_pad('',4096)."\n";            ob_flush();        flush();        sleep(2);}echo "Done.";ob_end_flush();?>

例2：输出一些字符，达到条件后跳转

<?php$web = "<h1>hello world</h1>";echo $web;ob_flush();flush();$data = 1;while (1) {sleep(1);$data++;if($data == 5) {echo "<meta http-equiv='Refresh' content='0;URL=return.php'>";break;}}

例3：输出一些字符，达到条件后跳转。

<?php$web = "<h1>hello world</h1>";echo $web;ob_flush();flush();while (1) {$fp = fopen("s.txt", "r");if(fgets($fp) == 1) {echo "<meta http-equiv='Refresh' content='0;URL=return.php'>";break;}fclose($fp);sleep(1);}

laravel下写的一个实例，读取缓存的变化
控制器：

<?phpnamespace App\Http\Controllers;use Illuminate\Http\Request;use App\Http\Requests;use Cache;class ScanLoginController extends Controller{    private $_cacheKey = 'longlink';    public function index()    {        Cache::put($this->_cacheKey, 0, 0);        return view('test.index');    }    public function login(Request $request)    {        $i = 0;        while ($i < 250) {            $fp = Cache::get($this->_cacheKey);            if($fp == 1) {                return ['status' => 1];            }            $i++;            usleep(100000);        }        return ['status' => 0];    }    public function confirm()    {        Cache::put($this->_cacheKey, 1, 0);        dump(Cache::get($this->_cacheKey));    }}

视图：

<html><head>    <title>test</title>    <meta charset="UTF-8">    <script src="//cdn.bootcss.com/jquery/3.1.0/jquery.min.js"></script>    <script>    $(function () {        function longlink() {            $("#show").text("正在连接");            $.get("{{ route('login') }}", function (data) {                if(data.status === 1) {                    $("#show").text("有反应了");                } else {                    $("#show").text("没反应，继续");                    longlink();                }            }, "json");        }        $("#begin").click(function () {            longlink();        });    });    </script></head><body>    <div class="container">        <h1>长连接</h1>        <button id="begin" class="btn btn-success">开始</button>        <div id="show">我是一个长连接</div>    </div></body></html>

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