How to output in realtime when number is change?

问题

I have this code for output :

$tot_clicks6 = $db->FetchArray($db->Query("SELECT SUM(visits) AS sum_visits FROM surf"));

and

<?=$tot_clicks6['sum_visits']?>

is display total of number.

回答1:

Your question represents a common misconception with PHP. The block of code

<?=$tot_clicks6['sum_visits']?>

Is only that code in your server. As the page is loaded, it gets served as HTML as whatever the value of that variable is. For example,

In order to update your page in real time, you need to use AJAX.

See this question

Get variable from PHP file using JQuery/AJAX

回答2:

Or you can use a real time framework. I work for Realtime.co and we do just that.

You can get a free license at www.realtime.co, get the PHP API at http://www.xrtml.org/downloads_62.html#pubsub:php and use the following code for the page that should broadcast the information (your administration page, for example). Note: this code is the same you can find at Github for the ORTC example (https://github.com/RTWWorld/pubsub-examples/tree/master/PHP) adapted for your needs.

<?php
error_reporting(E_ALL);
session_start();
require('./ortc.php');

/* -------------------- */
/* REPLACE THESE VALUES */
/* -------------------- */
$URL = 'http://ortc-developers.realtime.co/server/2.1';
$AK = 'YOUR_APPLICATION_KEY';// your realtime.co application key
$PK = 'YOUR_APPLICATION_PRIVATE_KEY';// your realtime.co private key
$TK = 'YOUR_AUTHENTICATION_TOKEN';// token: could be randomly generated in the session
$CH = 'MyChannel'; //channel
$ttl = 180; 
$isAuthRequired = false;
$result = false;
/* -------------------- */
/*        END           */
/* -------------------- */

// ORTC auth
// on a live usage we would already have the auth token authorized and stored in a php session
// Since a developer appkey does not require authentication the following code is optional

if( ! array_key_exists('ortc_token', $_SESSION) ){    
    $_SESSION['ortc_token'] = $TK;       
}   

$rt = new Realtime( $URL, $AK, $PK, $TK );  

    // Your query
    $tot_clicks6 = $db->FetchArray($db->Query("SELECT SUM(visits) AS sum_visits FROM surf"));

if($isAuthRequired){
    $result = $rt->auth(
        array(
            $CH => 'w'
        ), 
        $ttl
    );//post authentication permissions. w -> write; r -> read
    echo 'authentication status '.( $result ? 'success' : 'failed' ).'<br/>';
}

if($result || !$isAuthRequired){
    $result = $rt->send($CH, tot_clicks6['sum_visits'], $response);
    echo ' send status '.( $result ? 'success' : 'failed' ).'<br/>';
}    

?>

On the receiver page, you'll need to receive the data, using JavaScript and display it. For this example I'm just alerting the user with the data.

<!doctype html>
<html>
<head>
</head>
<body>

    <script src="http://code.xrtml.org/xrtml-3.2.0.js"></script>
    <script>
        var appkey = 'YOUR_APPLICATION_KEY';
        var url = 'http://ortc-developers.realtime.co/server/2.1';
        var authToken = 'YOUR_AUTHENTICATION_TOKEN';
        var channel = 'MyChannel';

        xRTML.load(function(){

            xRTML.Config.debug = true;

            xRTML.ConnectionManager.create({
                id: 'myConn',
                appkey: appkey,
                authToken: authToken,
                url: url,
                channels: [
                {name: channel}
                ]
            }).bind({
                message: function(e) {
                    alert(e);
                }
        });
        });
    </script>
</body>
</html>

With this code you won't need to use AJAX or anything like that. You'll be able to push your data to browsers instead.

Hope it helps!

来源：https://stackoverflow.com/questions/16524727/how-to-output-in-realtime-when-number-is-change

标签

php

real-time-updates