PHP: Exif Functions - Manual

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exif_imagetype user_error

Last updated: Fri, 26 Jan 2007

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# XXXIV. Exif Functions

# Введение

With the exif extension you are able to work with image meta data. For example, you may use exif functions to read meta data of pictures taken from digital cameras by working with information stored in the headers of the JPEG and TIFF images.

# Требования

Your PHP must be compiled in with `--enable-exif`. PHP does not require any additional library for the exif module. Windows users must also have the mbstring extension enabled.

# Установка

To enable exif-support configure PHP with `--enable-exif`

Windows users must enable both the `php_mbstring.dll` and `php_exif.dll` DLL's in `php.ini`. The `php_mbstring.dll` DLL must be loaded before the `php_exif.dll` DLL so adjust your `php.ini` accordingly.

# Настройка во время выполнения

Поведение этих функций зависит от установок в `php.ini`.

Exif supports automatically conversion for Unicode and JIS character encodings of user comments when module mbstring is available. This is done by first decoding the comment using the specified characterset. The result is then encoded with another characterset which should match your `HTTP` output.

Таблица 1. Exif configuration options

Name | Default | Changeable | Changelog
--- | --- | --- | ---
exif.encode_unicode | "ISO-8859-15" | PHP_INI_ALL | Available since PHP 4.3.0.
exif.decode_unicode_motorola | "UCS-2BE" | PHP_INI_ALL | Available since PHP 4.3.0.
exif.decode_unicode_intel | "UCS-2LE" | PHP_INI_ALL | Available since PHP 4.3.0.
exif.encode_jis | "" | PHP_INI_ALL | Available since PHP 4.3.0.
exif.decode_jis_motorola | "JIS" | PHP_INI_ALL | Available since PHP 4.3.0.
exif.decode_jis_intel | "JIS" | PHP_INI_ALL | Available since PHP 4.3.0.

Для подробного описания констант PHP_INI_*, обратитесь к документации функции ini_set().

Краткое разъяснение конфигурационных директив.

`exif.encode_unicode` string

  `exif.encode_unicode` defines the characterset UNICODE user comments are handled. This defaults to ISO-8859-15 which should work for most non Asian countries. The setting can be empty or must be an encoding supported by mbstring. If it is empty the current internal encoding of mbstring is used.

`exif.decode_unicode_motorola` string

  `exif.decode_unicode_motorola` defines the image internal characterset for Unicode encoded user comments if image is in motorola byte order (big-endian). This setting cannot be empty but you can specify a list of encodings supported by mbstring. The default is UCS-2BE.

`exif.decode_unicode_intel` string

  `exif.decode_unicode_intel` defines the image internal characterset for Unicode encoded user comments if image is in intel byte order (little-endian). This setting cannot be empty but you can specify a list of encodings supported by mbstring. The default is UCS-2LE.

`exif.encode_jis` string

  `exif.encode_jis` defines the characterset JIS user comments are handled. This defaults to an empty value which forces the functions to use the current internal encoding of mbstring.

`exif.decode_jis_motorola` string

  `exif.decode_jis_motorola` defines the image internal characterset for JIS encoded user comments if image is in motorola byte order (big-endian). This setting cannot be empty but you can specify a list of encodings supported by mbstring. The default is JIS.

`exif.decode_jis_intel` string

  `exif.decode_jis_intel` defines the image internal characterset for JIS encoded user comments if image is in intel byte order (little-endian). This setting cannot be empty but you can specify a list of encodings supported by mbstring. The default is JIS.

# Типы ресурсов

Данное расширение не определяет никакие типы ресурсов.

# Предопределенные константы

Перечисленные ниже константы определены данным расширением и могут быть доступны только в том случае, если PHP был собран с поддержкой этого расширения или же в том случае, если данное расширение подгружается во время выполнения.

`EXIF_USE_MBSTRING` (integer)

The exif_imagetype() lists several related built-in constants.

add a note User Contributed Notes
Exif Functions
webmaster at robert-beran dot de
30-Nov-2006 02:07
`here the link to my exif data remover function:
http://robert-beran.de/dl.php?id=4
its written in php so you can use it to remove jpg exif data in your php projects.
greetz
Robert`
ishida at w3 dot org
21-Sep-2006 04:36
`Not to mention Arabic, Hebrew, Chinese, the many Indic scripts, Thai, Greek, etc., etc.`
23-Dec-2004 02:55
`exif.encode_unicode string
exif.encode_unicode defines the characterset UNICODE user comments are handled. This defaults to ISO-8859-15 which should work for most non Asian countries. The setting can be empty or must be an encoding supported by mbstring. If it is empty the current internal encoding of mbstring is used.
How come ISO-8859-15 works for most non-Asian countries? It's only for West European and does NOT work for Russian, Greek, Albanian, Polish, Czech, and so forth. The default should be 'UTF-8'`
add a note
exif_imagetype user_error

Last updated: Fri, 26 Jan 2007
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