how to pass JavaScript value to PHP page

It is showing undefined function in PHP page.And i made every possible way it is not working for me.Please guys help me with this.

<!DOCTYPE html>
<html>
    <head>
        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
    </head>
    <body>
       <div id="myDiv">Welcome to stackoverflow</div>
    </body>
    <script>
       $(document).ready(function(){
            var mb = $('#myDiv').text();
            $.ajax({
                action : "six-cuf.php",
                type: 'POST',
                data: { 'mb': mb},
                success:function(data)
                {
                    alert(mb);   
                }
            });
        });
    
    </script>
</html>

JavaScript
​x
 
<!DOCTYPE html><html>    <head>        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>    </head>    <body>       <div id="myDiv">Welcome to stackoverflow</div>    </body>    <script>       $(document).ready(function(){            var mb = $('#myDiv').text();            $.ajax({                action : "six-cuf.php",                type: 'POST',                data: { 'mb': mb},                success:function(data)                {                    alert(mb);                   }            });        });        </script></html>​

PHP CODE

<?php  
  $fname = $_POST['mb'];
?>

JavaScript
 
<?php    $fname = $_POST['mb'];?>​

Answer

Hello

$(document).ready(function(){
  var mb = $('#myDiv').text();
  $.ajax({
    action : "six-cuf.php",
    type: 'POST',
    data: { mb: mb},
    success:function(data)
    {
      alert(mb);   
    }
  });
});

JavaScript
 
$(document).ready(function(){  var mb = $('#myDiv').text();  $.ajax({    action : "six-cuf.php",    type: 'POST',    data: { mb: mb},    success:function(data)    {      alert(mb);       }  });});​

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Answer