What is the best way to load different PHP pages into an iframe on a website?

To load different PHP pages into an iframe on a website, you can use a combination of HTML and PHP. You can create a PHP script that dynamically generates the content based on a parameter passed through the URL. Then, use this parameter in the iframe src attribute to load the desired PHP page.

<?php
// Get the page parameter from the URL
$page = isset($_GET['page']) ? $_GET['page'] : 'default.php';

// Include the requested PHP page
include($page);
?>
```

In your HTML file, you can use the following iframe tag to load the PHP page based on the parameter:

```html
<iframe src="iframe_content.php?page=page1.php" width="100%" height="500px"></iframe>