这篇文章主要介绍了php通过exif_read_data函数获取图片的exif信息，默认情况下，PHP读取图片Exif信息模块是不开启的，我们需要先开启这个模块。开启Exif模块需要mbstring支持，这里就不详细说明了，我们来先看下函数的用法

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，代码来自php手册

1. <?php
2. echo "test1.jpg:<br />\n";
3. $exif = exif_read_data('tests/test1.jpg', 'IFD0');
4. echo $exif===false ? "No header data found.<br />\n" : "Image contains headers<br />\n";
5. $exif = exif_read_data('tests/test2.jpg', 0, true);
6. echo "test2.jpg:<br />\n";
7. foreach ($exif as $key => $section) {
8. foreach ($section as $name => $val) {
9. echo "$key.$name: $val<br />\n";
10. }
11. }
12. ?>

输出结果如下

1. test1.jpg:
2. No header data found.
3. test2.jpg:
4. FILE.FileName: test2.jpg
5. FILE.FileDateTime: 1017666176
6. FILE.FileSize: 1240
7. FILE.FileType: 2
8. FILE.SectionsFound: ANY_TAG, IFD0, THUMBNAIL, COMMENT
9. COMPUTED.html: width="1" height="1"
10. COMPUTED.Height: 1
11. COMPUTED.Width: 1
12. COMPUTED.IsColor: 1
13. COMPUTED.ByteOrderMotorola: 1
14. COMPUTED.UserComment: Exif test image.
15. COMPUTED.UserCommentEncoding: ASCII
16. COMPUTED.Copyright: Photo (c) M.Boerger, Edited by M.Boerger.
17. COMPUTED.Copyright.Photographer: Photo (c) M.Boerger
18. COMPUTED.Copyright.Editor: Edited by M.Boerger.
19. IFD0.Copyright: Photo (c) M.Boerger
20. IFD0.UserComment: ASCII
21. THUMBNAIL.JPEGInterchangeFormat: 134
22. THUMBNAIL.JPEGInterchangeFormatLength: 523
23. COMMENT.0: Comment #1.
24. COMMENT.1: Comment #2.
25. COMMENT.2: Comment #3end
26. THUMBNAIL.JPEGInterchangeFormat: 134
27. THUMBNAIL.Thumbnail.Height: 1
28. THUMBNAIL.Thumbnail.Height: 1