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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).

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4  
enclose it in quotes.. res = '<?php echo json_encode($res); ?>'; –  Shankar Damodaran Mar 25 at 12:12
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2 Answers

up vote 2 down vote

Try-

res = "<?php echo json_encode($res); ?>";
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That does not work. If I do console.log(res); after the above statement, res is output as "<?php echo json_encode($res); ?>". –  Sriram Mar 25 at 12:22
    
You file must be a .php. Is it? –  Sahil Mittal Mar 25 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 at 12:30
    
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! –  Sahil Mittal Mar 25 at 12:32
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up vote 0 down vote

You can't, you'll have to do something like

<script type="text/javascript">
   var php_var = "<?php echo $php_var; ?>";
</script>

You can also load it with AJAX

rhino is right, the snippet lacks of a type for the sake of brevity.

Also, note that if $php_var has quotes, it will break your script. You shall use addslashes, htmlentities or a custom function.

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