使用AJAX将JavaScript转换为php

I am trying to send the score of an application to the database using AJAX.

Here is the application code

var score=count;

$.ajax({            
    url: 'ajax.php',            
    type: 'get',            
    data: {score: score},
    success : function(data)
    {
        alert("Succeed");
    }

});

ajax.php

<?php

$score= isset($_POST['score'])? $_POST['score'] : '';  

echo $score; 
$query=mysql_connect("localhost","admin","");
mysql_select_db("fypdb",$query); 
$sqlqury="insert into fypdbtable (score)values('". $_POST['$score']."') where username=($_SESSION['sess_firstname'])");

?>

I want to send the variable score using AJAX to ajax.php and then to fypdb database in fypdbtable.

In your Ajax code you're setting the type to 'GET' and in your PHP code you're using 'POST'

Use 'GET' or 'POST' in both