PHP上传图片时，如何exif_read_data获取exif

php获取

的exif信息，php自带一个exif_read_data函数可以用来读取的exif信息，代码来自php手册：
<php
echo "test1jpg:<br />\n";
$exif = exif_read_data('tests/test1jpg', 'IFD0');
echo $exif===false "No header data found<br />\n" : "Image contains headers<br />\n";
$exif = exif_read_data('tests/test2jpg', 0, true);
echo "test2jpg:<br />\n";
foreach ($exif as $key => $section) {
foreach ($section as $name => $val) {
  echo "$key$name: $val<br />\n";
}
}
>

输出结果如下

test1jpg:
No header data found
test2jpg:
FILEFileName: test2jpg
FILEFileDateTime: 1017666176
FILEFileSize: 1240
FILEFileType: 2
FILESectionsFound: ANY_TAG, IFD0, THUMBNAIL, COMMENT
COMPUTEDhtml:  
COMPUTEDHeight: 1
COMPUTEDWidth: 1
COMPUTEDIsColor: 1
COMPUTEDByteOrderMotorola: 1
COMPUTEDUserComment: Exif test image
COMPUTEDUserCommentEncoding: ASCII
COMPUTEDCopyright: Photo (c) MBoerger, Edited by MBoerger
COMPUTEDCopyrightPhotographer: Photo (c) MBoerger
COMPUTEDCopyrightEditor: Edited by MBoerger
IFD0Copyright: Photo (c) MBoerger
IFD0UserComment: ASCII
THUMBNAILJPEGInterchangeFormat: 134
THUMBNAILJPEGInterchangeFormatLength: 523
COMMENT0: Comment #1
COMMENT1: Comment #2
COMMENT2: Comment #3end
THUMBNAILJPEGInterchangeFormat: 134
THUMBNAILThumbnailHeight: 1
THUMBNAILThumbnailHeight: 1

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