How can ob_start() and ob_get_clean() be used to manipulate content in PHP include files?

To manipulate content in PHP include files, you can use ob_start() to start output buffering and ob_get_clean() to get the buffered content and clean the buffer. This allows you to capture the output of an included file, manipulate it as needed, and then output the modified content.

ob_start();
include 'your_include_file.php';
$included_content = ob_get_clean();

// Manipulate $included_content as needed

echo $included_content;