如何在循环中使用file_get_contents？

Question

I'm trying to use file_get_contents on loop, in order to fetch JSON string from an URL continuously (every second). And i need to store the result into a javascript variable. Here was my approach, but i didn't get any result from this. My page showed me nothing but endless loading.

<?php
    set_time_limit(0);
    while(true)
    {
    $jsonContent=file_get_contents('http://megarkarsa.com/gpsjson.php');
    echo $jsonContent;
    sleep(10);
    }

?>

And here my javascript code.

setInterval(function(){
        var jsonUpdPostData = <?php echo $jsonContent; ?>;
}, 100);

What should i do to make it work? Any suggestion will be appreciated.

Answer 1

You can make it work this way:

getContent.php

<?php
echo file_get_contents('http://megarkarsa.com/gpsjson.php');

xxxx.js

setInterval(function(){
  var xmlhttp = new XMLHttpRequest();

  xmlhttp.onreadystatechange = function() {
    if (xmlhttp.readyState == 4) {
      alert(xmlhttp.responseText); // this contains the new file contents
    }
  }

  xmlhttp.open('GET', 'getContent.php');
  xmlhttp.send();
}, 100);