PHP อยากส่งข้อมูลในตัวแปรไปยังอีกหน้าแต่ทำไม่ได้ครับ

<?php
include('connect.php');
//session_start();
date_default_timezone_set('Asia/Bangkok');

if (isset($_POST['saveMgstatus'])) {
    $u_id = $_POST['user_id'];
    $created = $_POST['created'];
    $time = $_POST['time'];
    $status = $_POST['status'];
    $maxDegree = $_POST['maxDegree'];
    $global_num = $_POST['global_num'];
    saveMgstatus($conn,$u_id,$created,$time,$maxDegree,$global_num,$status);
}

function saveMgstatus($conn, $u_id, $created, $time, $maxDegree,$global_num, $status)
{
    $sql = "INSERT INTO `mgstatus` (`mgid`, `user_id`, `created`, `time`, `degree`, `count`, `status`) VALUES 
    (NULL, '$u_id', '$created', '$time', '$maxDegree', '$global_num', '$status');";

    if ($conn->query($sql) === TRUE) {
        echo "New record created successfully";
		echo "<script>
		window.location.href='file_name.php?u_id=$u_id&created=$created&maxDegree=$maxDegree';
		</script>";
    } else {
        echo "Error: " . $sql . "<br>" . $conn->error;
    }
}
	
?>