yourls-change-error-messages

When attempting a new short url, YOURLS default behavior is to simply send out an error message:

• whenever a requested custom keyword already exists in the database
• when a url already exists in the databse and define( 'YOURLS_UNIQUE_URLS', true ); is set in config.php

This plugin changes that behavior and the content of those messages so that:

• If a keyword already exists, the error message will display the URL for that keyword.
• If the URL already exists, its shortened url will be returned and the share box will be displayed.

This also works so that the API returns postive values as well.