php angular

<?php
    $host = "localhost";
    $user = "root";
    $pass = "";
    $database = "learnangular";

    $conn = mysql_connect($host,$user,$pass);
    if (!$conn) die ("gagal melakukan koneksi");
    mysql_select_db($database, $conn) or die ("Database tidak di temukan");

    switch($_GET['action']){
        case 'insert';
            $data = json_decode(file_get_contents("php://input"));
            $i = 0;
            foreach($data as $k => $v) {
                $sql = "INSERT INTO siswa(nama,kelas) values ('".$v->nama."','".$v->kelas."')";
                mysql_query($sql);
                $i++;
            };
            echo $i;
            break;
    }
?>