Resource Types
ID3 Functions
ID3
PHP Manual

# Predefined Constants

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_0` (integer)
  `ID3_V1_0` is 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_1` (integer)
  `ID3_V1_1` is 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_1` (integer)
  `ID3_V2_1` is used if you are working with ID3 V2.1 tags.
`ID3_V2_2` (integer)
  `ID3_V2_2` is used if you are working with ID3 V2.2 tags.
`ID3_V2_3` (integer)
  `ID3_V2_3` is used if you are working with ID3 V2.3 tags.
`ID3_V2_4` (integer)
  `ID3_V2_4` is used if you are working with ID3 V2.4 tags.
`ID3_BEST` (integer)
  `ID3_BEST` is used if would like to let the id3 functions determine which tag version should be used.

Resource Types
ID3 Functions
ID3
PHP Manual