php - How to get geo location (coordinates) from image file? -

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i've searched everywhere couldn't find solution, decided write own class in php. succeed in iphone image file , instagram image not sure if works other cameras android supported phones , cameras gps. can me out this? below code , implementation.

    <?php      class filer {          /**          * variables          */          private $_gpslatitude;         private $_gpslongitude;         private $_gpslatituderef;         private $_gpslongituderef;          /**          * constructor method          */         public function __construct(){             /**              * gps meta (in reference iphone's image file)              * may android folow same thing (haven't checked)              */             $this->_gpslatitude = 'gpslatitude';             $this->_gpslongitude = 'gpslongitude';             $this->_gpslongituderef = 'gpslatituderef';             $this->_gpslongituderef = 'gpslongituderef';         }          /**          * check if file contains gps information          * @param: (string)$_file          * @return: (array) file's exif data (if file contains gps information)          */          public function getcoordinate($_file){             $_metas = $this->checkgps($_file);             $_gps = $_metas['gps'];             $_latitude = $this->dmstodec(                 $_gps[$this->_gpslatitude][0],                  $_gps[$this->_gpslatitude][1],                  $_gps[$this->_gpslatitude][2],                  $_gps[$this->_gpslongituderef]             );             $_longitude = $this->dmstodec(                 $_gps[$this->_gpslongitude][0],                  $_gps[$this->_gpslongitude][1],                  $_gps[$this->_gpslongitude][2],                  $_gps[$this->_gpslongituderef]             );              $_location = array($_latitude, $_longitude);             return $_location;         }          /**          * check if file contains gps information          * @param: (string)$_file          * @return: (array) file's exif data (if file contains gps information)          */         public function checkgps($_file){             return exif_read_data($_file, 'gps', true);         }          /**          * meta information of file          * @param: (string)$_file          * @return: (array) file's exif data          *           */         public function getexif($_file){             return exif_read_data($_file, 'ifd0', true);         }          /**          * converts dms ( degrees / minutes / seconds )          * decimal format longitude / latitude          * @param: (string)$_deg, (string)$_min, (string)$_sec, (string)$_ref          * @return: (float)          */         private function dmstodec($_deg, $_min, $_sec, $_ref){              $_array = explode('/', $_deg);             $_deg = $_array[0]/$_array[1];             $_array = explode('/', $_min);             $_min = $_array[0]/$_array[1];             $_array = explode('/', $_sec);             $_sec = $_array[0]/$_array[1];              $_coordinate = $_deg+((($_min*60)+($_sec))/3600);             /**              *  + + = north/east              *  + - = north/west              *  - - = south/west              *  - + = south/east                     */             if('s' === strtolower($_ref) || 'w' === strtolower($_ref)){                 // negatify coordinate                 $_coordinate = 0-$_coordinate;             }              return $_coordinate;         }              /**          *           * converts decimal longitude / latitude dms          * ( degrees / minutes / seconds )           *          * piece of code may appear           * inefficient, avoid issues floating          * point math extract integer part , float          * part using string function.          * @param: (string)$_file          * @return: (array)          */         private function dectodms($_dec){             $_vars = explode(".", $_dec);             $_deg = $vars[0];             $_tempma = "0.".$_vars[1];              $_tempma = $_tempma * 3600;             $_min = floor($_tempma / 60);             $_sec = $_tempma - ($_min*60);              return array("deg"=>$_deg, "min"=>$_min, "sec"=>$_sec);         }      } // end class      /**      *      * usage example      *       */     $_file = './image2.jpg';     $_filer = new filer();     if($_filer->checkgps($_file)){         $_location = $_filer->getcoordinate($_file);         // file doesn't have gps information         echo '<h4>file\'s gps information</h4>';         var_dump($_location);     } else {         // file doesn't have gps information         echo '<h4>sorry file doesn\'t supply gps information</h4>';         var_dump($_filer->getexif($_file));     } ?>

the exiv2 documentation has excellent tags reference may identify fields may have missed. implementation otherwise looks pretty solid me, can't see glaring errors.

exif tags supported exiv2


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