Echo Last Auto-increment ID in PHP

PHP
1

I want the below code to display the last Auto-increment id on a php page. Where am i going wrong?

<?php 
    include '../db_connection.php';
    $sql = "SELECT max(id) FROM  receipt";
    $result = $conn->query($sql);
    echo $result;
?>
2

You forgot to fetch the result of the query

3

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