Remove unused code

- Remove commented code
- Remove unused/immediately overwritten variables
- Remove extraneous parameters
- Remove unreachable code
- Remove duplicate array keys

src/Model/Photo.php

@@ -172,7 +172,6 @@ class Photo extends BaseObject
 	 */
 	public static function getImageForPhoto(array $photo)
 	{
-		$data = "";
 		if ($photo["backend-class"] == "") {
 			// legacy data storage in "data" column
 			$i = self::selectFirst(["data"], ["id" => $photo["id"]]);
@@ -268,7 +267,6 @@ class Photo extends BaseObject
 		// if is an existing photo, reuse same backend
 		$data = "";
 		$backend_ref = "";
-		$backend_class = "";
 
 		if (DBA::isResult($existing_photo)) {
 			$backend_ref = (string)$existing_photo["backend-ref"];
@@ -276,6 +274,7 @@ class Photo extends BaseObject
 		} else {
 			$backend_class = StorageManager::getBackend();
 		}
+
 		if ($backend_class === "") {
 			$data = $Image->asString();
 		} else {