Description:
------------
While it works on many files exif_read_data returns corrupted GPS data on others.

exif_read_data returns bad latitude and longitude values for the following file : http://trekmaniac3.free.fr/Canaries2006/images/thumb/IMG_3801.jpg

FYI, xnview, robogeo (and others) are able to read and return correct GPS data from that file. The expected values are :
latitude=27?38'26.39"
longitude=17?58'49.93"

When analyzing the data returns by exif_read_data, it looks like there's a 3 value shift in the array of the rational values returned.

This problem occurs in every php version I tried : 4.3.10 or 5.2.0







Reproduce code:
---------------
$exif=exif_read_data('IMG_3801.jpg');
foreach ($exif as $key => $section) {
		print_r($section);
    foreach ($section as $name => $val) {
        echo "$key.$name: $val<br />\n"; 
        
      }
}

Expected result:
----------------
GPSLatitude.0: 452984832/16777216
GPSLatitude.1: 637534208/16777216
GPSLatitude.2: 442812995/16777216

GPSLongitude.0:285212672/16777216
GPSLongitude.1:973078528/16777216
GPSLongitude.2:837753660/16777216

...

Actual result:
--------------
GPS tags returned :

GPSLatitude.0: 542065991/808334710
GPSLatitude.1: 3224110/452984832
GPSLatitude.2: 16777216/637534208
GPSLongitude.0: 16777216/442812995
GPSLongitude.1: 16777216/285212672
GPSLongitude.2: 16777216/973078528
GPSTimeStamp.0: 16777216/837753660
GPSTimeStamp.1: 16777216/9
GPSTimeStamp.2: 1/49