Include PHP inside JavaScript (.js) files

Question

I have a JavaScript file (extension .js, not .html) containing several JavaScript functions.

I want to call one of the PHP functions in a PHP file containing only several PHP functions from within one of the JavaScript functions.

• Is that possible?
• Would I need to "include" the .php file containing the PHP function in the .js file?
• How would I do that?
  For example, say I had a file called myLib.php containing a function called myFunc that takes two parameters (param1 and param2). Then I have a .js file containing a function called myJsFunc. How would a call the myFunc (PHP) from within the myJsFunc (JavaScript function)? Wouldn't I need to include the PHP file somehow in the .js file?

Answer 1

7 years later update: This is terrible advice. Please don't do this.

If you just need to pass variables from PHP to the javascript, you can have a tag in the php/html file using the javascript to begin with.

<script type="text/javascript">
    var phpVars = <?php echo json_encode($vars) ?>;
</script>
<script type="text/javascript" src="yourScriptThatUsesPHPVars.js"></script>

If you're trying to call functions, then you can do this like this

<script type="text/javascript" src="YourFunctions.js"></script>
<script type="text/javascript">
    // assume each element of $arrayWithVars has already been json_encoded
    functionOne(<?php echo implode(', ', $arrayWithVars); ?>);

    functionTwo(<?php echo json_encode($moreVars) ?>, <?php echo json_encode($evenMoreVars) ?>);
</script>