gistfile1.php

<?PHP
// JSON results is the default
$rt = new Ranktracker($this->accessSecret, $this->accessToken);

// Get all your pairs - this works fine
var_dump($rt->get_all());

//$data['keyword']='smart income';
//$data['url']='http://www.smartpassiveincome.com';

$data = <<<'EOT'
<?xml version="1.0" encoding="UTF-8"?>
<pair>
  <url>http://www.smartpassiveincome.com</url>
  <keyword>smart income</keyword>
</pair>
EOD;

$pairid = $rt->create($data);

echo var_dump($rt->exists($pairid));