Can't properly access values from an exif array

Question

I'm trying to Get the gps lat and log from exif but I'm unable to access the index properly. Here's what the basic var_dump looks like:

array(7) { ["FILE"]=> array(6) { ["FileName"]=> string(12) "DSC00043.JPG" ["FileDateTime"]=> int(1481834862) ["FileSize"]=> int(4259986) ["FileType"]=> int(2) ["MimeType"]=> string(10) "image/jpeg" ["SectionsFound"]=> string(44) "ANY_TAG, IFD0, THUMBNAIL, EXIF, GPS, INTEROP" } ["COMPUTED"]=> array(10) { ["html"]=> string(26) "width="6000" height="4000"" ["Height"]=> int(4000) ["Width"]=> int(6000) ["IsColor"]=> int(1) ["ByteOrderMotorola"]=> int(0) ["ApertureFNumber"]=> string(5) "f/5.6" ["UserComment"]=> NULL ["UserCommentEncoding"]=> string(5) "ASCII" ["Thumbnail.FileType"]=> int(2) ["Thumbnail.MimeType"]=> string(10) "image/jpeg" } ["IFD0"]=> array(13) { ["ImageDescription"]=> string(31) " " ["Make"]=> string(4) "SONY" ["Model"]=> string(9) "ILCE-6300" ["Orientation"]=> int(1) ["XResolution"]=> string(5) "350/1" ["YResolution"]=> string(5) "350/1" ["ResolutionUnit"]=> int(2) ["Software"]=> string(15) "ILCE-6300 v1.10" ["DateTime"]=> string(19) "2016:01:17 22:26:22" ["YCbCrPositioning"]=> int(2) ["Exif_IFD_Pointer"]=> int(8) ["GPS_IFD_Pointer"]=> int(47147) ["UndefinedTag:0xC4A5"]=> string(106) "PrintIM0300 " ' '� '� ' '^ '� '� '� '" } ["THUMBNAIL"]=> array(13) { ["Compression"]=> int(6) ["ImageDescription"]=> string(31) " " ["Make"]=> string(4) "SONY" ["Model"]=> string(9) "ILCE-6300" ["Orientation"]=> int(1) ["XResolution"]=> string(4) "72/1" ["YResolution"]=> string(4) "72/1" ["ResolutionUnit"]=> int(2) ["Software"]=> string(15) "ILCE-6300 v1.10" ["DateTime"]=> string(19) "2016:01:17 22:26:22" ["JPEGInterchangeFormat"]=> int(38350) ["JPEGInterchangeFormatLength"]=> int(8797) ["YCbCrPositioning"]=> int(2) } ["EXIF"]=> array(38) { ["ExposureTime"]=> string(6) "1/1000" ["FNumber"]=> string(5) "56/10" ["ExposureProgram"]=> int(1) ["ISOSpeedRatings"]=> int(1000) ["UndefinedTag:0x8830"]=> int(2) ["UndefinedTag:0x8832"]=> int(1000) ["ExifVersion"]=> string(4) "0230" ["DateTimeOriginal"]=> string(19) "2016:01:17 22:26:22" ["DateTimeDigitized"]=> string(19) "2016:01:17 22:26:22" ["ComponentsConfiguration"]=> string(4) " " ["CompressedBitsPerPixel"]=> string(3) "1/1" ["BrightnessValue"]=> string(10) "21294/2560" ["ExposureBiasValue"]=> string(4) "0/10" ["MaxApertureValue"]=> string(7) "760/256" ["MeteringMode"]=> int(5) ["LightSource"]=> int(0) ["Flash"]=> int(16) ["FocalLength"]=> string(6) "190/10" ["MakerNote"]=> string(9) "SONY DSC " ["UserComment"]=> string(64) "ASCII" ["FlashPixVersion"]=> string(4) "0100" ["ColorSpace"]=> int(1) ["ExifImageWidth"]=> int(6000) ["ExifImageLength"]=> int(4000) ["InteroperabilityOffset"]=> int(47385) ["FileSource"]=> string(1) " " ["SceneType"]=> string(1) " " ["CustomRendered"]=> int(0) ["ExposureMode"]=> int(1) ["WhiteBalance"]=> int(0) ["DigitalZoomRatio"]=> string(5) "16/16" ["FocalLengthIn35mmFilm"]=> int(28) ["SceneCaptureType"]=> int(0) ["Contrast"]=> int(0) ["Saturation"]=> int(0) ["Sharpness"]=> int(0) ["UndefinedTag:0xA432"]=> array(4) { [0]=> string(6) "190/10" [1]=> string(6) "190/10" [2]=> string(5) "28/10" [3]=> string(5) "28/10" } ["UndefinedTag:0xA434"]=> string(11) "E 19mm F2.8" } ["GPS"]=> array(6) { ["GPSVersion"]=> string(4) " " ["GPSLatitudeRef"]=> string(1) "N" ["GPSLatitude"]=> array(3) { [0]=> string(4) "34/1" [1]=> string(3) "5/1" [2]=> string(11) "231365/9853" } ["GPSLongitudeRef"]=> string(1) "W" ["GPSLongitude"]=> array(3) { [0]=> string(4) "83/1" [1]=> string(4) "59/1" [2]=> string(11) "100499/4849" } ["GPSAltitude"]=> string(12) "2219798/6091" } ["INTEROP"]=> array(2) { ["InterOperabilityIndex"]=> string(3) "R98" ["InterOperabilityVersion"]=> string(4) "0100" } }

I've been using this function just to get the my $exifs['FileName']; because it is also an unknown index if I were to just echo it out: I also try to access the gps array in this function.

public function get_data($files){
    $data = array();
    $name = '';
    foreach ($files as $file) {
        $exifs   = exif_read_data($file, 0, true);
        //var_dump($exifs);
        foreach ($exifs as $exif) {
            extract($exif);
            $name = $FileName;
            foreach ($GPS as $key) {
                echo $key;
                # code...
            }
            break;
        }
    }
    return $name;
}

If you want more help, you need to post the `var_dump()` with decent indentation, so we can see the nesting level of everything. — Barmar, Dec 16 '16 at 22:44
So $exifs['file path']['key'] would give me access to even array parameters? Sorry about the indentation I'm on mobile, I'll do my best to fix it. — Austin Mauldin, Dec 16 '16 at 22:54
Use `echo '
'; var_dump($exifs); echo '
';` to get PHP to display the formatted dump. — Barmar, Dec 16 '16 at 22:56
When you have nested arrays, the syntax is `$array["outer key"]["inner key"]` — Barmar, Dec 16 '16 at 22:57
A `json_encode()` version of `$exifs` would be much easier to test with. We can't run your code with manually converting the `var_dump()` output into a proper value that your script can work with... — Guillaume Boudreau, Dec 16 '16 at 23:06

score 0 · Accepted Answer · edited May 23 '17 at 11:45

You can simply access values from such an object by specifying the keys: $exifs['FILE']['FileName'] for example.

To get the filename, lat and lon values for all the files, you'd do something like:

public function get_data($files) {
    $data = array();
    foreach ($files as $file) {
        $exifs = exif_read_data($file, 0, true);
        $data[] = [
            'filename' => $exifs['FILE']['FileName'],
            'gps_lat' => $exifs['GPS']['GPSLatitude'],
            'gps_lon' => $exifs['GPS']['GPSLongitude'],
        ]
    }
    return $data;
}

Of note, the lat and lon values are kind of funky, not the 'usual' format. See this answer to transform the gps_lat and gps_lon values into floats.

Can't properly access values from an exif array

1 Answers1