Fix possible XSS attack through white/black lists

php/get.php

@@ -12,4 +12,18 @@ for($i = sizeof($list)-1; $i >= 0; $i--) {
         unset($list[$i]);
 }
 
-echo json_encode(array_values($list));
+function filterArray(&$a) {
+    $sanArray = array();
+    foreach ($a as $k=>$v) {
+        if (is_array($v)) {
+            $sanArray[htmlspecialchars($k)] = filterArray($v);
+        } else {
+            $sanArray[htmlspecialchars($k)] = htmlspecialchars($v);
+        }
+    }
+    return $sanArray;
+}
+
+// Protect against XSS attacks
+$list = filterArray($list);
+echo json_encode(array_values($list));