Using mime_content_type for image mime detecting

Author: jeroendesloovere

src/VCard.php

@@ -215,10 +215,7 @@ private function addMedia($property, $url, $include = true, $element)
             }
 
             $value = base64_encode($value);
-
-            $finfo = finfo_open(FILEINFO_MIME_TYPE);
-            $mimetype = finfo_file($finfo, 'data://application/octet-stream;base64,' . $value);
-            finfo_close($finfo);
+            $mimetype = mime_content_type($url);
 
             if (preg_match('/^image\//', $mimetype) !== 1) {
                 throw new VCardMediaException('Returned data aren\'t an image.');