从PHP中的m4a文件中检索ID3信息

<?php
$filename = 'path/to/file.m4a';

// 打开m4a文件
$file = new \SplFileObject($filename, 'r');

// 定位到ID3标签的起始位置
$file->fseek(-128, SEEK_END);

// 读取ID3标签内容
$id3Tag = $file->fread(128);

// 关闭文件
$file = null;

// 解析ID3标签内容
$tagData = unpack('a3identifier/a30title/a30artist/a30album/a4year/a28comment/Cgenre', $id3Tag);

// 提取ID3信息
$identifier = trim($tagData['identifier']);
$title = trim($tagData['title']);
$artist = trim($tagData['artist']);
$album = trim($tagData['album']);
$year = trim($tagData['year']);
$comment = trim($tagData['comment']);
$genre = trim($tagData['genre']);

// 输出ID3信息
echo "Identifier: $identifier\n";
echo "Title: $title\n";
echo "Artist: $artist\n";
echo "Album: $album\n";
echo "Year: $year\n";
echo "Comment: $comment\n";
echo "Genre: $genre\n";
?>