got rid of PHP Warning: count(): Parameter must be an array or an object that...

got rid of PHP Warning:  count(): Parameter must be an array or an object that implements Countable in /home/eyesis/git/elphel-tools-x393/extract_images.php on line 218

extract_images.php

@@ -215,7 +215,7 @@ function elphel_specific_result_name($file){
       
     }else{
         $ks = $exif['PageNumber'];
-        if (count($ks==2)){
+        if (is_array($ks) && (count($ks) ==2)){
             $k = $ks[0];
         }else{
             $k = intval($exif['PageNumber'])+1;