What are the best practices for structuring and organizing navigation data in PHP for small websites?

When structuring and organizing navigation data in PHP for small websites, it is best to use an array to store the navigation links and their corresponding URLs. This allows for easy management and customization of the navigation menu. By creating a separate file to store the navigation data, you can include it in your PHP templates to dynamically generate the navigation menu. 

<?php
// navigation.php

$navigation = array(
    'Home' => '/',
    'About' => '/about',
    'Services' => '/services',
    'Contact' => '/contact'
);
?>

```

To implement the navigation menu in your PHP template file:

```php
<?php
// index.php

include 'navigation.php';

echo '<ul>';
foreach ($navigation as $title => $url) {
    echo '<li><a href="' . $url . '">' . $title . '</a></li>';
}
echo '</ul>';
?>

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