What are some alternative public CD databases, besides freedb.org, that can be accessed and utilized in PHP applications?

One alternative public CD database that can be accessed and utilized in PHP applications is MusicBrainz. MusicBrainz offers a free and open database of music metadata, including information about CDs and tracks. By using the MusicBrainz API, you can retrieve CD information and incorporate it into your PHP application.

// Example code to retrieve CD information from MusicBrainz API
$barcode = '123456789'; // CD barcode
$apiUrl = 'https://musicbrainz.org/ws/2/release/?query=barcode:' . $barcode;

$response = file_get_contents($apiUrl);
$data = json_decode($response, true);

if ($data && isset($data['releases'][0])) {
    $cdTitle = $data['releases'][0]['title'];
    $artist = $data['releases'][0]['artist-credit'][0]['artist']['name'];
    
    echo "CD Title: $cdTitle\n";
    echo "Artist: $artist\n";
} else {
    echo "CD information not found";
}