将变量从JavaScript传递到PHP代码不起作用

Question

I am trying to pass 2 variables from PHP to JavaScript and the vice versa.

I understand how to pass one variable, and it's okay, but when I tried to pass 2 variales, one of them passed, the other one didn't work.

Here is the code:

(1) file1.php:

<script type="text/javascript"> 
var id = <?php echo $id ; ?>
var q= <?php echo $q ; ?>
</script>
<script type="text/javascript"src="http://localhost/site/js/java.js">      </script>

(2) Java.js:

http://localhost/site/file2.php?id="+id +"&q="+q

(3) file2.php:

 $id = $_GET['id']; >> it works fine
 $q= $_GET['q']; >> doesn't pass (error: undefined)

I am not sure where the problem is, I just think it's in the number (2) step.

Any help will be appreciated.

Answer 1

As per comments, if q is a string then it needs to be enclosed in quotes. Remember all you php code is doing is generating text.

var q= <?php echo $q ; ?>

Should be

var q= "<?php echo $q ; ?>";