Plugin for YOURLS.

This plugin checks if a long URL is already shortened (e.g. t.co, bit.ly, youtu.be) etc. The purpose is to avoid nested shortened links.

1. In /user/plugins, create a new folder named shortshort.
2. Drop these files in that directory.
3. Go to the Plugins administration page ( eg http://sho.rt/admin/plugins.php ) and activate the plugin.
4. Have fun!