user_error
Mbstring must be loaded before exif. PHP setup program put them in the wrong order in the ini file and I couldn't use exif at all. Had to switch order in the ini file for it to work.
XXXIV. Exif Functions
Úvod
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.
Požadavky
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.
Instalace
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.
Konfigurace běhu
Chování těchto funkcí je ovlivněno nastavením parametrů v 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.
Tabulka 77. 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. |
Pro další detaily a definice konstant PHP_INI_*, viz dokumentace k ini_set().
Zde je stručný popis konfiguračních direktiv.
- 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.
Typy prostředků
Toto rozšíření nemá definován žádný typ prostředku (resource).
Předdefinované konstanty
Tyto konstanty jsou definovány tímto rozšířením a budou k dispozici pouze tehdy, bylo-li rozšíření zkompilováno společně s PHP nebo dynamicky zavedeno za běhu.
- EXIF_USE_MBSTRING (integer)
The exif_imagetype() lists several related built-in constants.
Obsah
- 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 pro exif_read_data()
add a note
User Contributed NotesExif Functions
phedberg at gmail dot com
19-Jun-2007 01:22
19-Jun-2007 01:22
webmaster at robert-beran dot de
30-Nov-2006 02:07
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
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'