How can PHP beginners effectively use ob_get_content() to modify included content without direct access to the source file?

When PHP beginners need to modify included content without direct access to the source file, they can use ob_get_contents() to capture the output buffer, make the necessary modifications, and then output the modified content. This function allows them to manipulate the content before it is sent to the browser.

ob_start();

// Include the file with the content to modify
include 'file_to_modify.php';

// Get the contents of the output buffer
$content = ob_get_contents();

// Modify the content as needed
$content = str_replace('old_text', 'new_text', $content);

// Clear the output buffer
ob_end_clean();

// Output the modified content
echo $content;