更新（刷新）PHP 变量而不刷新网站

Question

I am trying to make updating variable called $online without refreshing site.

Theres is my try:

data.php

<?php
    include("steam.php");
    $data =  $online;// obtain current value of data from somewhere
    echo $data; // should be an integer
?>

refresh.js

$(document).ready( function () {
    var data = []; // data is empty
    var graph = Morris.Bar({
      element: 'graph',
      data: data
      labels: ['random label']
    });

    function update () {
      $.getJSON( "data.php", function (newv) {
        data.push( { x: newv, y: "Today" } ); // store new value
        graph.setData( data );                // update the graph
      });
    }

    update();
    setInterval( update, 1000 );
  });

Answer 1

I just ran this through so I know it works. My previous comment will do the job. I know $.getJSON is similar so I don't know what conflicts you will have there, but the below will update your php variable.

<script>
 $.post( "data.php", { online: "UpdatedData" } );
</script>

data.php

$online = $_POST['online'];