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I've recently come across the php function exif_read_data - which is pretty awesome. I'm using it on my photography site, and while it works pretty well, I'm struggling to work out why ApertureFNumber isn't working. The code I'm using is:

$exif_data = exif_read_data($image[0]);

echo $exif_data['Model'];
echo $exif_data['ExposureTime'];
echo $exif_data['FNumber'];
echo $exif_data['ApertureFNumber'];
echo $exif_data['ISOSpeedRatings'];
echo $exif_data['DateTime'];

(styling removed)

I used FNumber as well as ApertureFNumber for testing because FNumber works, while ApertureFNumberjust returns blank. All the other fields work fine.

I did a var_dump of $exif_data - and this is what I get (the abridged version):

["ApertureFNumber"]=> string(5) "f/3.5"
["FNumber"]=> string(5) "35/10"

What have I missed that FNumber works, but ApertureFNumber doesn't?

--

EDIT - Complete var_dump added as requested

array(52) { ["FileName"]=> string(18) "MYD-67-900x602.jpg" ["FileDateTime"]=> int(0) ["FileSize"]=> int(123278) ["FileType"]=> int(2) ["MimeType"]=> string(10) "image/jpeg" ["SectionsFound"]=> string(30) "ANY_TAG, IFD0, THUMBNAIL, EXIF" ["COMPUTED"]=> array(9) { ["html"]=> string(24) "width="900" height="602"" ["Height"]=> int(602) ["Width"]=> int(900) ["IsColor"]=> int(1) ["ByteOrderMotorola"]=> int(0) ["ApertureFNumber"]=> string(5) "f/3.5" ["FocusDistance"]=> string(14) "4294967296.00m" ["Thumbnail.FileType"]=> int(2) ["Thumbnail.MimeType"]=> string(10) "image/jpeg" } ["Make"]=> string(17) "NIKON CORPORATION" ["Model"]=> string(9) "NIKON D60" ["XResolution"]=> string(5) "200/1" ["YResolution"]=> string(5) "200/1" ["ResolutionUnit"]=> int(2) ["Software"]=> string(41) "Adobe Photoshop Lightroom 4.4 (Macintosh)" ["DateTime"]=> string(19) "2013:07:06 10:07:40" ["Exif_IFD_Pointer"]=> int(216) ["THUMBNAIL"]=> array(6) { ["Compression"]=> int(6) ["XResolution"]=> string(5) "200/1" ["YResolution"]=> string(5) "200/1" ["ResolutionUnit"]=> int(2) ["JPEGInterchangeFormat"]=> int(932) ["JPEGInterchangeFormatLength"]=> int(8995) } ["ExposureTime"]=> string(5) "1/800" ["FNumber"]=> string(5) "35/10" ["ExposureProgram"]=> int(1) ["ISOSpeedRatings"]=> int(100) ["ExifVersion"]=> string(4) "0230" ["DateTimeOriginal"]=> string(19) "2008:10:30 16:04:34" ["DateTimeDigitized"]=> string(19) "2008:10:30 16:04:34" ["ShutterSpeedValue"]=> string(15) "9643856/1000000" ["ApertureValue"]=> string(13) "361471/100000" ["ExposureBiasValue"]=> string(3) "0/6" ["MaxApertureValue"]=> string(5) "36/10" ["SubjectDistance"]=> string(4) "-1/1" ["MeteringMode"]=> int(5) ["LightSource"]=> int(0) ["Flash"]=> int(0) ["FocalLength"]=> string(4) "18/1" ["SubSecTimeOriginal"]=> string(2) "50" ["SubSecTimeDigitized"]=> string(2) "50" ["SensingMethod"]=> int(2) ["FileSource"]=> string(1) "" ["SceneType"]=> string(1) "" ["CFAPattern"]=> string(8) "" ["CustomRendered"]=> int(0) ["ExposureMode"]=> int(1) ["WhiteBalance"]=> int(0) ["DigitalZoomRatio"]=> string(3) "1/1" ["FocalLengthIn35mmFilm"]=> int(27) ["SceneCaptureType"]=> int(0) ["GainControl"]=> int(0) ["Contrast"]=> int(0) ["Saturation"]=> int(0) ["Sharpness"]=> int(0) ["SubjectDistanceRange"]=> int(0) ["UndefinedTag:0xA431"]=> string(7) "6265825" ["UndefinedTag:0xA432"]=> array(4) { [0]=> string(4) "18/1" [1]=> string(4) "55/1" [2]=> string(5) "35/10" [3]=> string(5) "56/10" } ["UndefinedTag:0xA434"]=> string(22) "18.0-55.0 mm f/3.5-5.6" }
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2 回答 2

2

尝试这个：

$exif = exif_read_data($image[0]);
foreach($exif as $exif_data){
echo $exif_data['Model']."<br/>";
echo $exif_data['ExposureTime']."<br/>";
echo $exif_data['FNumber']."<br/>";
echo "ApertureFNumber is:" .$exif_data['ApertureFNumber']."<br/>";
echo $exif_data['ISOSpeedRatings']."<br/>";
echo $exif_data['DateTime']."<br/>";
}
于 2013-09-07T18:23:11.550 回答
0

所以，我现在想通了 - 并认为您可能希望看到答案。

var_dump 正在提供数据["ApertureFNumber"]=> string(5) "f/3.5"，但并没有真正让我到任何地方，所以我使用了print_r($exif_data). 这打印出了一大堆有用的数据，包括以下内容：

[COMPUTED] => Array
        (
            [html] => width="1000" height="667"
            [Height] => 667
            [Width] => 1000
            [IsColor] => 1
            [ByteOrderMotorola] => 0
            [ApertureFNumber] => f/3.5
            [Thumbnail.FileType] => 2
            [Thumbnail.MimeType] => image/jpeg
            [Thumbnail.Height] => 171
            [Thumbnail.Width] => 256
        )

因此，为了呼应ApertureFNumber我简单地使用它的需要
echo $exif['COMPUTED']['ApertureFNumber'];，它也适用于打印数组中的任何信息。

希望这对将来的其他人有所帮助。

于 2013-10-14T13:57:31.963 回答