function send (){

    function player (name,club){
    this.name = name,
    this.club = club
    }
    var player1 = new player('aubamayang','arsenal');
    var array = new Array();
    array.push(player1);

    var jsonText = JSON.stringify(array);
    var ajax = new XMLHttpRequest();
    xhr.onreadystatechange = function (){
        if (this.readyState == 4 && this.status == 200){
                         }

    }
    xhr.open("POST","http://localhost/quiz/test.php",true);
    xhr.setRequestHeader("Content-Type", "application/json");

    xhr.send(jsonText);

    }

<?php
    header("Content-Type: application/json");
    $var = $_POST ;
    json_decode($_POST);
    echo ' <script>alert($var.length)</script>' ;
    $host="127.0.0.1";
    $user="root";
    $password="";
    $database="tasks";
    echo 'connected';
    //$connect = mysqli_connect($host,$user,$password,$database);
    //$query = "insert into test (name,club)values('".$data['name']."','".$data['club']."')";
    //mysqli_query($connect , $query);


?>