Output the differences between two PHP config files (php.ini)

ini-diff.php

<?php

# REF: 
# Nginx: https://codewithsusan.com/notes/upgrade-php-nginx
# Apache: https://codewithsusan.com/notes/upgrade-php-apache

# UPDATE THESE TWO PATHS:
$current = '/path/to/current/php.ini';
$previous = '/path/to/previous/php.ini';

$currentSettings = parse_ini_file($current);
$previousSettings = parse_ini_file($previous);

$diffSettings1 = array_diff($previousSettings, $currentSettings);
$diffSettings2 = array_diff($currentSettings, $previousSettings);

$diffSettings = array_merge($diffSettings1, $diffSettings2);
?>

<table>
    <tr>
        <th>Setting</th>
        <th>Previous<br> <?=$previous?></th>
        <th>Current <br> <?=$current?></th>
    </tr>

    <?php foreach($diffSettings as $setting => $value): ?>
        <td><?=$setting?></td>
        <td><?=$previousSettings[$setting] ?? '[Setting not present]' ?></td>
        <td><?=$currentSettings[$setting] ?? '[Setting not present]'?></td>
    </tr>
    <?php endforeach; ?>
</table>

<style>
    body {
        font-family:Courier;
    }
    
    table {
        table-layout: fixed;
        width:100%;
        border-collapse:collapse;
    }

    table, th, td {
        border: 1px solid;
    }

    td {
        padding:10px;
        word-wrap: break-word;
    }
</style>