Title: EXIF code simplicication – update
Last modified: August 22, 2016

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# EXIF code simplicication – update

 *  [thermador](https://wordpress.org/support/users/thermador/)
 * (@thermador)
 * [11 years, 6 months ago](https://wordpress.org/support/topic/exif-code-simplicication-update/)
 * Reading the ideas here: [https://wordpress.org/support/topic/exif-code-simplification?replies=2](https://wordpress.org/support/topic/exif-code-simplification?replies=2)
 * … I have finally moved away from using YAPB’s native EXIF display, which is not
   customizable in any way, other than selecting which tags you want to display.
   You can’t alter the tag names, you can’t alter the order, etc.
 * I wish that YAPB had better EXIF parsing, like the old PhotoQ plugin, which gives
   much more control over EXIF tags and you can even convert EXIF tags to wordpress
   tags, so you could find all posts made with a certain camera or focal length,
   for example: [https://github.com/andrewelkins/PhotoQ-WordPress-Photoblog-Plugin](https://github.com/andrewelkins/PhotoQ-WordPress-Photoblog-Plugin)
 * So I turned off YAPB’s EXIF, and did this instead:
 * I put this in my theme’s functions.php file:
 *     ```
       // this function converts a fractional EXIF value to something we can use, see below where it's used to fix the format of the focal length
   
       function exif_get_float($value) {
         $pos = strpos($value, '/');
         if ($pos === false) return (float) $value;
         $a = (float) substr($value, 0, $pos);
         $b = (float) substr($value, $pos+1);
         return ($b == 0) ? ($a) : ($a / $b);
       } 
   
       // This function is used to determine the camera details for a specific image. It returns an array with the parameters.
       function cameraUsed($imagePath) {
   
         // The default empty array to return
           $return = array(
               'make'      => "",
               'model'     => "",
               'exposure'  => "",
               'aperture'  => "",
               'iso'       => "",
       	'date'       => "",
       	'lens'       => "",
       	'distance'       => "",
       	'focallength'       => "",
       	'focallength35'       => "",
       	'flashdata' => "",
       	'lensmake' => ""
           );
   
         // There are 2 arrays which contains the information we are after, so it's easier to state them both
           $exif_ifd0 = read_exif_data($imagePath ,'IFD0' ,0);
           $exif_exif = read_exif_data($imagePath ,'EXIF' ,0);
   
         // Ensure that we actually got some information
         if (($exif_ifd0 !== false) AND ($exif_exif !== false)) {
   
          // Camera Make
          if (@array_key_exists('Make', $exif_ifd0)) {
             $return['make']     = $exif_ifd0['Make'];
                   }
   
         // Camera Model
         if (@array_key_exists('Model', $exif_ifd0)) {
             $return['model']    = $exif_ifd0['Model'];
                   }
   
         // Exposure Time (shutter speed)
         if (@array_key_exists('ExposureTime', $exif_ifd0)) {
            $return['exposure'] = $exif_ifd0['ExposureTime'] . " sec.";
                   }
   
         // Aperture
         if (@array_key_exists('ApertureFNumber', $exif_ifd0['COMPUTED'])) {
            $return['aperture'] = $exif_ifd0['COMPUTED']['ApertureFNumber'];
                   }
   
         // ISO
         if (@array_key_exists('ISOSpeedRatings',$exif_exif)) {
             $return['iso'] = $exif_exif['ISOSpeedRatings'];
                   }
   
         // Date
         if (@array_key_exists('DateTime', $exif_ifd0)) {
             $return['date'] = $exif_ifd0['DateTime'];
                   }
   
         // Lens
         if (@array_key_exists('UndefinedTag:0xA434',$exif_exif)) {
             $return['lens'] = $exif_exif['UndefinedTag:0xA434'];
       		    }
   
         // Focus Distance
         if (@array_key_exists('FocusDistance', $exif_ifd0['COMPUTED'])) {
             $return['distance'] = $exif_ifd0['COMPUTED']['FocusDistance'];
       	        }
   
         // Focal Length
         if (@array_key_exists('FocalLength',$exif_exif)) {
       		$apex = exif_get_float($exif_exif['FocalLength']);
       		$flength = round($apex);
       		$return['focallength'] = $flength . " mm";
       		//$return['focallength'] = $exif_exif['FocalLength'];
       		    }
   
         // Focal Length 35mm
         if (@array_key_exists('FocalLengthIn35mmFilm',$exif_exif)) {
             $return['focallength35'] = $exif_exif['FocalLengthIn35mmFilm'] . " mm";
       		    }
   
         // Flash data
         if (@array_key_exists('Flash',$exif_exif)) {
       		// we need to interpret the result - it's given as a number and we want a human-readable description.  see WordPress's PhotoQ plugin's EXIF tools for more examples
       		$fdata = $exif_exif['Flash'];
   
       		if ($fdata == 0) $fdata = 'No Flash';
       		else if ($fdata == 1) $fdata = 'Flash';
       		else if ($fdata == 5) $fdata = 'Flash, strobe return light not detected';
       		else if ($fdata == 7) $fdata = 'Flash, strob return light detected';
       		else if ($fdata == 9) $fdata = 'Compulsory Flash';
       		else if ($fdata == 13) $fdata = 'Compulsory Flash, Return light not detected';
       		else if ($fdata == 15) $fdata = 'Compulsory Flash, Return light detected';
       		else if ($fdata == 16) $fdata = 'No Flash';
       		else if ($fdata == 24) $fdata = 'No Flash';
       		else if ($fdata == 25) $fdata = 'Flash, Auto-Mode';
       		else if ($fdata == 29) $fdata = 'Flash, Auto-Mode, Return light not detected';
       		else if ($fdata == 31) $fdata = 'Flash, Auto-Mode, Return light detected';
       		else if ($fdata == 32) $fdata = 'No Flash';
       		else if ($fdata == 65) $fdata = 'Red Eye';
       		else if ($fdata == 69) $fdata = 'Red Eye, Return light not detected';
       		else if ($fdata == 71) $fdata = 'Red Eye, Return light detected';
       		else if ($fdata == 73) $fdata = 'Red Eye, Compulsory Flash';
       		else if ($fdata == 77) $fdata = 'Red Eye, Compulsory Flash, Return light not detected';
       		else if ($fdata == 79) $fdata = 'Red Eye, Compulsory Flash, Return light detected';
       		else if ($fdata == 89) $fdata = 'Red Eye, Auto-Mode';
       		else if ($fdata == 93) $fdata = 'Red Eye, Auto-Mode, Return light not detected';
       		else if ($fdata == 95) $fdata = 'Red Eye, Auto-Mode, Return light detected';
       		else $fdata = 'Unknown: ' . $fdata;
   
             $return['flashdata'] = $fdata;
       		    }
   
         // Lens Make
         if (@array_key_exists('UndefinedTag:0xA433',$exif_exif)) {
             $return['lensmake'] = $exif_exif['UndefinedTag:0xA433'];
       		    }
   
         }
       	// Return either an empty array, or the details which we were able to extract
           return $return;
   
       }
       ```
   
 * And I put the below in my theme template for the single post (in my case, single.
   php). This way, I decide the format (unordered list (ul/li tags)) and the order
   of the EXIF tags, and I can hide them (if(!empty) tests) if there is no data:
 *     ```
       <?php
   
       //get the full URL of the post's YAPB image
       $exifimg = site_url() . $post->image->uri;
   
       //use the function we created to get the EXIF data
       $camera = cameraUsed( $exifimg );
   
       //display the EXIF data using PHP and a whole lot of "echo"
       //note that quotes must be escaped by a backslash, see first line below
   
       //start an unordered list
       echo "<ul class=\"ul-exif\">";
   
       //generate the list items, if they exist
       if (!empty($camera['make'])) {
         echo "<li class=\"li-exif\">Camera Make: <i>" . $camera['make'] . "</i></li>";
       }
       if (!empty($camera['model'])) {
         echo "<li class=\"li-exif\">Camera Model: <i>" . $camera['model'] . "</i></li>";
       }
       if (!empty($camera['lensmake'])) {
         echo "<li class=\"li-exif\">Lens Make: <i>" . $camera['lensmake'] . "</i></li>";
       }
       if (!empty($camera['lens'])) {
         echo "<li class=\"li-exif\">Lens Model: <i>" . $camera['lens'] . "</i></li>";
       }
       if (!empty($camera['exposure'])) {
         echo "<li class=\"li-exif\">Shutter Speed: <i>" . $camera['exposure'] . "</i></li>";
       }
       if (!empty($camera['aperture'])) {
         echo "<li class=\"li-exif\">Aperture: <i>" . $camera['aperture'] . "</i></li>";
       }
       if (!empty($camera['iso'])) {
         echo "<li class=\"li-exif\">ISO Value: <i>" . $camera['iso'] . "</i></li>";
       }
       if (!empty($camera['focallength'])) {
         echo "<li class=\"li-exif\">Focal Length: <i>" . $camera['focallength'] . "</i></li>";
       }
       if (!empty($camera['focallength35'])) {
         echo "<li class=\"li-exif\">35mm-equiv.: <i>" . $camera['focallength35'] . "</i></li>";
       }
       if (!empty($camera['flashdata'])) {
         echo "<li class=\"li-exif\">Flash: <i>" . $camera['flashdata'] . "</i></li>";
       }
       if (!empty($camera['distance'])) {
         echo "<li class=\"li-exif\">Focus Distance: <i>" . $camera['distance'] . "</i></li>";
       }
       //close the unordered list
       echo "</ul>";
       ?>
       ```
   
 * [https://wordpress.org/plugins/yet-another-photoblog/](https://wordpress.org/plugins/yet-another-photoblog/)

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## Tags

 * [exif](https://wordpress.org/support/topic-tag/exif/)
 * [Yapb](https://wordpress.org/support/topic-tag/yapb/)

 * 0 replies
 * 1 participant
 * Last reply from: [thermador](https://wordpress.org/support/users/thermador/)
 * Last activity: [11 years, 6 months ago](https://wordpress.org/support/topic/exif-code-simplicication-update/)
 * Status: not resolved