How can PHP includes be used in combination with if statements to display different content based on availability?

To display different content based on availability using PHP includes and if statements, you can create separate PHP files for each content option and then use an if statement to determine which file to include based on availability. This allows you to easily switch between different content options without duplicating code.

<?php
$available = true; // Set availability status here

if ($available) {
    include 'available_content.php';
} else {
    include 'unavailable_content.php';
}
?>