These functions let you read and manipulate ID3 tags. ID3 tags are used in MP3 files to store title of the song, as well as information about the artist, album, genre, year and track number.
Since version 0.2 it is also possible to extract text frames from ID3 v2.2+ tags.
id3 is part of PECL and can be installed using the PEAR installer. To compile PHP with id3 support, download the sourcecode, put it in php-src/ext/id3 and compile PHP using --enable-id3.
Most of the id3 functions either let you specify or return a tag version. In order to specify the version please use on of these constants.
ID3_V1_0is used if you are working with ID3 V1.0 tags. These tags may contain the fields title, artist, album, genre, year and comment.
ID3_V1_1is used if you are working with ID3 V1.1 tags. These tags may all information contained in v1.0 tags plus the track number.
ID3_V2_1is used if you are working with ID3 V2.1 tags.
ID3_V2_2is used if you are working with ID3 V2.2 tags.
ID3_V2_3is used if you are working with ID3 V2.3 tags.
ID3_V2_4is used if you are working with ID3 V2.4 tags.
ID3_BESTis used if would like to let the id3 functions determine which tag version should be used.