PHP Pemula - mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given

<?php

// Koneksi ke database
$conn = mysqli_connect("localhost", "root", "", "bedas");

// Function
function query($query)
{
    global $conn;
    $result = mysqli_query($conn, $query);
    $rows = [];
    while ($row = mysqli_fetch_assoc($result)) {
        $rows[] = $row;
    }
    return $rows;
}

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