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Editorial Team
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Asked: 2026-06-11T16:28:21+00:00

I am having trouble populating a Javascript variable from PHP. My index.php file is

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I am having trouble populating a Javascript variable from PHP.

My index.php file is in typical form i.e.

 <?php
  function blah () {}
  function doThis ($sUserID) {}
 ?>

 <HTML>
   <head>
     <script src="test.js"></script>  
   </head>

   show results
 </HTML>

Trouble is I need to populate a Javascript variable (in the ‘test.js’ file) with a value called from a PHP function (which is in the php file).

I have tried:

    var jsVar = '<?php echo doThis(sUserID)?>';
document.write("jsVar: ", jsVar);

But no result.

So how do I call the PHP function (in another PHP file) from test.js?

Thanks.

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1 Answer

  1. Editorial Team

    Just declare a global variable before test.js gets loaded, that should work

       <head>
     <script type="text/javascript>
       var jsVar = '<?php echo doThis(sUserID) ?>';
     </script>
     <script src="test.js"></script>  
   </head>

    If the doThis(sUserID); returns a valid string, it should work.

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