What are the implications of including unnecessary content, such as advertisements, when extracting data from external sources for use in a web application like a Flash web radio player?

Including unnecessary content like advertisements when extracting data from external sources can slow down the loading time of the web application, distract users from the main content, and potentially violate terms of service agreements with the external sources. To solve this issue, it is important to filter out any irrelevant content and only extract the necessary data for the web application.

// Example PHP code snippet to extract data from an external source without including unnecessary content like advertisements

$source_url = 'https://example.com/data-feed';
$data = file_get_contents($source_url);

// Filter out unnecessary content (e.g. advertisements) from the data
$filtered_data = extract_necessary_data($data);

// Process and use the filtered data in the web application
process_data($filtered_data);