Exif Functions
Introdução
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.
Dependências
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.
Instalação
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.
Configurações em execução
O comportamento dessas funções podem ser modificado pelas configurações do 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.
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. |
Breve descrição das diretivas de configuração.
- 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.
Tipos Resource
Esta extensão não possui nenhum tipo resource.
Constantes pré-definidas
As contantes abaixo são definidas por esta extensão e somente estarão disponíveis quando a extensão foi compilada com o PHP ou carregada dinamicamente durante a execução.
- EXIF_USE_MBSTRING (integer)
The exif_imagetype() lists several related built-in constants.
Índice
- exif_imagetype — Determine the type of an image
- exif_read_data — Reads the EXIF headers from JPEG or TIFF
- exif_tagname — Get the header name for an index
- exif_thumbnail — Retrieve the embedded thumbnail of a TIFF or JPEG image
- read_exif_data — Sinônimo de exif_read_data