php获取图片的exif信息，php自带一个exif_read_data函数可以用来读取图片的exif信息

<?php  echo "test1.jpg:<br />\n";  $exif = exif_read_data('tests/test1.jpg', 'IFD0');  echo $exif===false ? "No header data found.<br />\n" : "Image contains headers<br />\n";     $exif = exif_read_data('tests/test2.jpg', 0, true);  echo "test2.jpg:<br />\n";  foreach ($exif as $key => $section) {      foreach ($section as $name => $val) {          echo "$key.$name: $val<br />\n";      }  }  ?>

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