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# XLVII. ID3 Functions

# Einführung

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.

# Anforderungen

Diese Erweiterung benötigt keine externen Bibliotheken.

# Installation

id3 is part of PECL and can be installed using the PEAR installer. To compile PHP with id3 support, downloadthe sourcecode, put it in php-src/ext/id3 and compile PHP using --enable-id3.

# Laufzeit Konfiguration

Diese Erweiterung definiert keine Konfigurationseinstellungen in der `php.ini`.

# Resource Typen

Diese Erweiterung definiert keine Resource-Typen.

# 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` (integer)

  `ID3_V2` is used if you are working with ID3 V2.x tags. These tags are quite flexible and are currently not supported by the id3 extension.

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