EXIF_READ_DATA(3)							 1							 EXIF_READ_DATA(3)

exif_read_data - Reads theEXIFheaders fromJPEGorTIFF

SYNOPSIS

       array exif_read_data NULL (string  $filename, [string  $sections], [bool  $arrays = false], [bool  $thumbnail = false])

DESCRIPTION

       exif_read_data(3) reads the EXIF headers from a JPEG or TIFF image file. This way you can read meta data generated by digital cameras.

       EXIF headers tend to be present in JPEG/TIFF images generated by digital cameras, but unfortunately each digital camera maker has a differ-
       ent idea of how to actually tag their images, so you can't always rely on a specific Exif header being present.

       Height and Width are computed the same way getimagesize(3) does so their values must not be part of any header returned. Also,  html  is  a
       height/width text string to be used inside normal HTML.

	When  an Exif header contains a Copyright note, this itself can contain two values. As the solution is inconsistent in the Exif 2.10 stan-
       dard, the COMPUTED section will return both entries Copyright.Photographer and Copyright.Editor while the IFD0 sections contains  the  byte
       array  with  the NULL character that splits both entries. Or just the first entry if the datatype was wrong (normal behaviour of Exif). The
       COMPUTED will also contain the entry Copyright which is either the original copyright string, or a comma separated list of  the	photo  and
       editor copyright.

	The  tag  UserComment  has  the  same problem as the Copyright tag. It can store two values. First the encoding used, and second the value
       itself. If so the IFD section only contains the encoding or a byte array. The COMPUTED section will store  both	in  the  entries  UserCom-
       mentEncoding and UserComment. The entry UserComment is available in both cases so it should be used in preference to the value in IFD0 sec-
       tion.

       exif_read_data(3) also validates EXIF data tags according to the EXIF specification (http://exif.org/Exif2-2.PDF, page 20).

       Note

	       Windows Me/XP can both wipe the Exif headers when connecting to a camera.

PARAMETERS

	      o $filename
		- The name of the image file being read. This cannot be an URL.

	      o $sections
		- Is a comma separated list of sections that need to be present in file to produce a result array. If none of the  requested  sec-
		tions could be found the return value is FALSE.

	      +----------+---------------------------------------------------+
	      |  FILE	 |						     |
	      | 	 |						     |
	      | 	 |  FileName, FileSize, FileDateTime, SectionsFound  |
	      | 	 |						     |
	      |COMPUTED  |						     |
	      | 	 |						     |
	      | 	 |  html, Width, Height, IsColor, and more if avail- |
	      | 	 | able. Height and Width are computed the same  way |
	      | 	 | getimagesize(3)  does so their values must not be |
	      | 	 | part of any header  returned.  Also,  html  is  a |
	      | 	 | height/width text string to be used inside normal |
	      | 	 | HTML.					     |
	      | 	 |						     |
	      | ANY_TAG  |						     |
	      | 	 |						     |
	      | 	 | Any information that has a Tag e.g.	IFD0,  EXIF, |
	      | 	 | ...						     |
	      | 	 |						     |
	      |  IFD0	 |						     |
	      | 	 |						     |
	      | 	 |  All  tagged  data  of IFD0. In normal imagefiles |
	      | 	 | this contains image size and so forth.	     |
	      | 	 |						     |
	      |THUMBNAIL |						     |
	      | 	 |						     |
	      | 	 |  A file is supposed to contain a thumbnail if  it |
	      | 	 | has	a  second  IFD. All tagged information about |
	      | 	 | the embedded thumbnail is stored in this section. |
	      | 	 |						     |
	      | COMMENT  |						     |
	      | 	 |						     |
	      | 	 |	    Comment headers of JPEG images.	     |
	      | 	 |						     |
	      |  EXIF	 |						     |
	      | 	 |						     |
	      | 	 |  The EXIF section is a sub section  of  IFD0.  It |
	      | 	 | contains   more  detailed  information  about  an |
	      | 	 | image. Most of these entries are  digital  camera |
	      | 	 | related.					     |
	      | 	 |						     |
	      +----------+---------------------------------------------------+
	      o $arrays
		-  Specifies  whether or not each section becomes an array. The $sections COMPUTED, THUMBNAIL, and COMMENT always become arrays as
		they may contain values whose names conflict with other sections.

	      o $thumbnail
		- When set to TRUE the thumbnail itself is read. Otherwise, only the tagged data is read.

RETURN VALUES

	It returns an associative array where the array indexes are the header names and the array values are the  values  associated  with  those
       headers. If no data can be returned, exif_read_data(3) will return FALSE.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 4.3.0	|						    |
       |	|						    |
       |	|  Can	read all embedded IFD data including arrays |
       |	| (returned as such). Also the size of an  embedded |
       |	| thumbnail  is  returned  in a THUMBNAIL subarray, |
       |	| and can return thumbnails in TIFF  format.  Also, |
       |	| there  is no longer a maximum length for returned |
       |	| values (not  until  the  memory  limit  has  been |
       |	| reached)					    |
       |	|						    |
       | 4.3.0	|						    |
       |	|						    |
       |	|  If  PHP  has  mbstring support, the user comment |
       |	| can automatically change encoding. Also,  if	the |
       |	| user	comment  uses  Unicode or JIS encoding this |
       |	| encoding will automatically be changed  according |
       |	| to the exif ini settings in php.ini		    |
       |	|						    |
       | 4.3.0	|						    |
       |	|						    |
       |	|  If  the  image  contains any IFD0 data then COM- |
       |	| PUTED contains the entry ByteOrderMotorola  which |
       |	| is  0  for  little-endian  (intel) and 1 for big- |
       |	| endian (motorola) byte order. Also, COMPUTED	and |
       |	| UserComment  no  longer  only  contain  the first |
       |	| copyright entry if the datatype was wrong.	    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      exif_read_data(3) example

	      <?php
	      echo "test1.jpg:<br />
";
	      $exif = exif_read_data('tests/test1.jpg', 'IFD0');
	      echo $exif===false ? "No header data found.<br />
" : "Image contains headers<br />
";

	      $exif = exif_read_data('tests/test2.jpg', 0, true);
	      echo "test2.jpg:<br />
";
	      foreach ($exif as $key => $section) {
		  foreach ($section as $name => $val) {
		      echo "$key.$name: $val<br />
";
		  }
	      }
	      ?>

	       The first call fails because the image has no header information.

	      The above example will output something similar to:

	      test1.jpg:
	      No header data found.
	      test2.jpg:
	      FILE.FileName: test2.jpg
	      FILE.FileDateTime: 1017666176
	      FILE.FileSize: 1240
	      FILE.FileType: 2
	      FILE.SectionsFound: ANY_TAG, IFD0, THUMBNAIL, COMMENT
	      COMPUTED.html: width="1" height="1"
	      COMPUTED.Height: 1
	      COMPUTED.Width: 1
	      COMPUTED.IsColor: 1
	      COMPUTED.ByteOrderMotorola: 1
	      COMPUTED.UserComment: Exif test image.
	      COMPUTED.UserCommentEncoding: ASCII
	      COMPUTED.Copyright: Photo (c) M.Boerger, Edited by M.Boerger.
	      COMPUTED.Copyright.Photographer: Photo (c) M.Boerger
	      COMPUTED.Copyright.Editor: Edited by M.Boerger.
	      IFD0.Copyright: Photo (c) M.Boerger
	      IFD0.UserComment: ASCII
	      THUMBNAIL.JPEGInterchangeFormat: 134
	      THUMBNAIL.JPEGInterchangeFormatLength: 523
	      COMMENT.0: Comment #1.
	      COMMENT.1: Comment #2.
	      COMMENT.2: Comment #3end
	      THUMBNAIL.JPEGInterchangeFormat: 134
	      THUMBNAIL.Thumbnail.Height: 1
	      THUMBNAIL.Thumbnail.Height: 1

SEE ALSO

       exif_thumbnail(3), getimagesize(3).

PHP Documentation Group 													 EXIF_READ_DATA(3)