http://short.i2p/readme.html
php
$username = 'your_username';
$password = 'your_password';
$api_url = 'http://sho.rt/yourls-api.php';
// Init the CURL session
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $api_url);
curl_setopt($ch, CURLOPT_HEADER, 0); // No header in the result
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); // Return, do not echo result
curl_setopt($ch, CURLOPT_POST, 1); // This is a POST request
curl_setopt($ch, CURLOPT_POSTFIELDS, array( // Data to POST
...