"in" operator doesn't work with content of array.
-rw-r--r-- 951 extension.json
drwxr-xr-x - i18n
drwxr-xr-x - img
drwxr-xr-x - openlayers
drwxr-xr-x - tools
-rw-r--r-- 18240 wrmap.body.php
-rw-r--r-- 854 wrmap.css
-rw-r--r-- 10832 wrmap.js