How can a dropdown menu be used as a universal include file in PHP for navigation using GET variables?

To use a dropdown menu as a universal include file in PHP for navigation using GET variables, you can create a dropdown menu with links to different pages and use PHP to dynamically set the active page based on the GET variable. By including this dropdown menu in all your pages, you can easily navigate between pages using the GET variable to specify the active page. 

```php
<!-- navigation.php -->
<?php
$pages = array(
    'Home' => 'index.php',
    'About' => 'about.php',
    'Contact' => 'contact.php'
);

$current_page = isset($_GET['page']) ? $_GET['page'] : 'Home';
?>

<select onchange="location = this.value;">
    <?php foreach ($pages as $page => $url) : ?>
        <option value="<?php echo $url; ?>" <?php echo ($page == $current_page) ? 'selected' : ''; ?>><?php echo $page; ?></option>
    <?php endforeach; ?>
</select>
```

Include this navigation.php file in your pages where you want the dropdown menu to appear. It will dynamically set the active page based on the GET variable 'page' and allow users to navigate between pages using the dropdown menu.

Keywords

PHP dropdown menu universal include file navigation GET variables

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