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 = '<?php echo json_encode($res); ?>'; — Shankar Narayana Damodaran
– Shankar Narayana Damodaran, Commented Mar 25, 2014 at 12:12

Sahil Mittal · Accepted Answer · 2014-03-25 12:13:08Z

3

Try-

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

answered Mar 25, 2014 at 12:13

Sahil Mittal

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4 Comments

Sriram Over a year ago

That does not work. If I do console.log(res); after the above statement, res is output as "<?php echo json_encode($res); ?>".

Sahil Mittal Over a year ago

You file must be a .php. Is it?

Sriram Over a year ago

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?

Sahil Mittal Over a year ago

I'm not sure what are you trying to say; but - if you are using <?php ?> in a file that file must be a .php file- that's it!

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