How do I include a PHP variable in an external javascript file?

I want to include a PHP variable in an external javascript file. The PHP variable is used to set the javscript variable so the PHP variable is not being used. How would I do this?

I've been trying this.


Javascript code:

javascriptvar = <?PHP echo($PHPvar); ?>;

alert(javascriptvar);

Code (markup):

This code used to work, but now because it is in an external .js file it doesn't seem to work. Is this because the file type has to be .php. I thought that because I am including the .js file in the .php file it should just parse normally?

Thanks.

~imozeb

 

myjavascript.php

<?php
header("Content-Type: text/javascript");
echo "var javascriptvar = ' ".$phpvar." '; ";
echo "alert(javascriptvar);";
?>

PHP:

 

Do I have to echo out all of my javascript code or is there an easier way?

 

Then use this:

<?php header("Content-Type: text/javascript"); ?>
var javascriptvar = '<?php echo $phpvar; ?>';
alert(javascriptvar);

PHP: