http://short.i2p/readme.html
Example: define( 'YOURLS_PRIVATE', true ); YOURLS_UNIQUE_URLS Allow multiple short URLs for a same long URL Set to true to allow only one pair of shortURL/longURL (default YOURLS behavior), or to false to allow creation of multiple short URLs pointing to the same long URL (as bit.ly does) Example: define( 'YOURLS_UNIQUE_URLS', true ); YOURLS_COOKIEKEY A random secret hash used to encrypt cookies.