How to use a $_POST Variable in another file and function

First set of code, on separate page than second

<?php
include 'HytecFunctions.php';

if((isset($_POST["name"]))  ) {
$name = $_POST["name"];
addName($name);
}

Second and Separate Page code

function updateScore() {

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$conn = connectDB();

// Score Update
$name = "Test1";
// $name = getName();
$sql = $conn->prepare("SELECT Score FROM Names WHERE Name=?");
$sql->bind_param('s',$name);
$sql->execute();
$sql->bind_result($score);
$sql->fetch();
$sql->close();

The user enters a name and it is entered into a database as seen in the first code snippet. Then I need to use that $name in a separate code file so that it looks more like this, and stays dynamic with the user's name.

function updateScore() {

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$conn = connectDB();

$sql = $conn->prepare("SELECT Score FROM Names WHERE Name=?");
$sql->bind_param('s',$name);

I need the name to be entered and then used here to bind the user's name to the prepare statement.

$sql->execute();
$sql->bind_result($score);
$sql->fetch();
$sql->close();

Any ideas or help would be greatly appreciated!!