Runtime Configuration
The behaviour of these functions is affected by settings in
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.
Table 5. 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().
Here's a short explanation of the configuration directives.
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 Types
This extension has no resource types defined.
