XXVIII. Exif Functions

Einführung

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.

Anforderungen

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.

Installation

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.

Laufzeit Konfiguration

Das Verhalten dieser Funktionen wird durch Einstellungen in der php.ini beeinflusst.

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.

Tabelle 1. Exif configuration options

Name	Default	Changeable
exif.encode_unicode	"ISO-8859-15"	PHP_INI_ALL
exif.decode_unicode_motorola	"UCS-2BE"	PHP_INI_ALL
exif.decode_unicode_intel	"UCS-2LE"	PHP_INI_ALL
exif.encode_jis	""	PHP_INI_ALL
exif.decode_jis_motorola	"JIS"	PHP_INI_ALL
exif.decode_jis_intel	"JIS"	PHP_INI_ALL

For further details and definition of the PHP_INI_* constants see ini_set().

Hier eine kurze Erklärung der Konfigurationsoptionen:

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.

Resource Typen

Diese Erweiterung definiert keine Resource-Typen.

Vordefinierte Konstanten

Folgende Konstanten werden von dieser Erweiterung definiert und sind nur definiert, wenn die Erweiterung entweder statisch in PHP kompiliert oder dynamisch zur Laufzeit geladen wurde.

EXIF_USE_MBSTRING (integer)

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

Inhaltsverzeichnis
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 -- Alias of exif_read_data()