This example shows a PHP API that extracts direct video and audio stream URLs from YouTube by parsing the `get_video_info` response. It demonstrates how the code uses `file_get_contents` to fetch YouTube’s embedded video data, then employs `parse_str` and `explode` to decode the URL-encoded stream map. The API outputs a JSON array of available formats, including metadata like MIME type, resolution, and itag, while also handling error cases when a video is unavailable. The implementation relies on standard PHP functions and JSON encoding without external libraries.