php通过exif_read_data函数获取图片的exif信息

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

    <?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";
      }
    }
    ?>

输出结果如下

    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

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