Using Javascript to access PHP variables

Question

How can I access PHP variables from Javascript where the PHP code exists in a separate file?

The code I have is:

<?php
$res = "OK";
?>

<html>
<head>
   <script type="text/javascript">
   function myFunc() 
   {
      res = <?php echo json_encode($res); ?>;
      console.log("res = " + res);
   }
   </script>
</head>
<body>
   <button onclick="myFunc()">Click</button>
</body>
</html>

Now, if I were to move my php code to a separate file called a.php, how can I access $res? Assume I am calling a.php with a GET request (XMLHttpRequest object).

enclose it in quotes.. `res = '';` – Shankar Narayana Damodaran Mar 25 '14 at 12:12 — Shankar Narayana Damodaran, Mar 25 '14 at 12:12

score 3 · Accepted Answer · answered Mar 25 '14 at 12:13

3

Try-

res = "<?php echo json_encode($res); ?>";

answered Mar 25 '14 at 12:13

Sahil Mittal

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That does not work. If I do `console.log(res);` after the above statement, `res` is output as "". – Sriram Mar 25 '14 at 12:22
You file must be a `.php`. Is it? – Sahil Mittal Mar 25 '14 at 12:27
After removal of all `php` code to `a.php`, there is nothing left except `javascript` and `html`. Does the file still need to be renamed to .php? – Sriram Mar 25 '14 at 12:30
I'm not sure what are you trying to say; but - if you are using `` in a file that file must be a `.php` file- that's it! – Sahil Mittal Mar 25 '14 at 12:32

Using Javascript to access PHP variables

1 Answers1