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.

For further details and definitions of the PHP_INI_* modes, see the
Where a
configuration setting may be 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.