Can anyone tell me how can i get the value of a variable in jquery then control it at the level of server with php?

You will need to use Ajax in Jquery to pass the javascript variable to a php script and use it whatever you want.

Below is a declaration for  Ajax() in jQuery:

ajax()

You can do this using an Ajax call. Please find an example below:

<script type="text/javascript" language="javascript">

$(document).ready(function(){

// get your variable values upon some action or as per your desire. I am assuming you clicked a button to get some variable value.

$("#submit").click(function(){

var fullname = $("#fullname").val();

// Send an ajax call.

$.post("example.php", { fullname :fullname } , function( data ){       

    // Do something as per your logic.}, "json");

});

});

});

</script>

exmple.php<?php$fullname = $_POST['fullname'];

// Now you can use it on server side as you want.?>

There is a possibility of sending a javascript variable to php. You need to explain what exactly you are trying to do.