PHP-General - Uncaught ReferenceError: set_cookie is not defined

i get this error in this code when i look in the console on Google chrome:

Uncaught ReferenceError: set_cookie is not defined

this is the code:



<script src="js/lightbox.js"></script>
<link href="css/lightbox.css" rel="stylesheet" />
<script type="text/javascript">
function set_cookie(){
document.getElementById("cookie").innerHTML="<?php cookie_set() ?>";
}
$("#overlay").hide();
</script>

<?php
function cookie_set()
{
setcookie("allow_cookies","true",time() + (20 * 365 * 24 * 60 * 60));
}
?>

That code doesn't tell us anything. Where is that set_cookie() called? The console gives you the specific line of the error.

Your code doesn't make any sense. You are substituting a return value from cookie_set into your JavaScript definition but cookie_set does not return anything. That is not a normal PHP error message. There is no line number in the message.

set_cookie() is called by this:

<input name="ok_hide" type="button" onClick="set_cookie()" value="Ok, i get it.">

i want it to set a cookie, hide the button but i dont want it to redirect.

That makes even less sense. A JavaScript call will not redirect unless you program it to. PHP will never see that call anyway. You need to understand that JavaScript is client side and PHP is server side. Look at the source in your browser, is that what you expect for your JavaScript function definition?