how to assign javascript variable value to php variable

I have declared a javascript variable ,

 var myJavascriptVar = 12345;

And unable to assign that value to php variable;

 $myPhpVar = 'myJavascriptVar';

I know Ajax may be the solution of my problem. But i don't know how to use Ajax and solve the problem.

<html>
    <body>
        <script>
            var myJavascriptVar = 12345;
            <?php $myPhpVar='myJavascriptVar';?> 
        </script>
        <?php echo $myPhpVar; ?>
     </body>
</html>

Using Cookie is the better solution i think -

<script> document.cookie = "myJavascriptVar = " + myJavascriptVar </script>
<?php
     $myPhpVar= $_COOKIE['myJavascriptVar'];
?>

Try using ajax with jQuery.post() if you want a more dynamic assignment of variables.

The reason you can't assign a variable directly is because they are processed in different places.

It's like trying to add eggs to an already baked cake, instead you should send the egg to the bakery to get a new cake with the new eggs. That's what jQuery's post is made for.

Alert the results from requesting test.php with an additional payload of data (HTML or XML, depending on what was returned).

$.post( "test.php", { name: "John", time: "2pm" })
  .done(function( data ) {
    alert( "Data Loaded: " + data );
  });

how to assign javascript variable value to php variable

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