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# LXIII. ID3 Functions

# Introdução

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.

# Dependências

Nenhuma biblioteca externa é necessária para compilar esta extensão.

# Instalação

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.

# Configurações em execução

Esta extensão não define nenhum parâmetro de configuração no `php.ini`.

# Tipos Resource

Esta extensão não possui nenhum tipo resource.

# 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.

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