What are the best practices for handling global metadata and changing stream conditions in PHP-generated MP3 streams?

When handling global metadata and changing stream conditions in PHP-generated MP3 streams, it is important to use the appropriate headers and functions to modify the metadata and stream conditions. This can be achieved by using the PHP functions such as header() to set the content type and length, as well as id3_set_tag() to modify the ID3 tags of the MP3 file. 

// Set content type and length headers
header('Content-Type: audio/mpeg');
header('Content-Length: ' . filesize($mp3_file));

// Open the MP3 file
$mp3_file = 'example.mp3';
$fp = fopen($mp3_file, 'rb');

// Modify ID3 tags
id3_set_tag($mp3_file, [
    'title' => 'New Title',
    'artist' => 'New Artist',
    'album' => 'New Album',
]);

// Stream the MP3 file
while (!feof($fp)) {
    echo fread($fp, 1024);
}

// Close the file
fclose($fp);

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