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<?php
$url = 'http://sendgrid.com/';
$user = 'USERNAME';
$pass = 'PASSWORD';
$fileName = 'myfile';
$filePath = dirname(__FILE__);
$params = array(
    'api_user'  => $user,
    'api_key'   => $pass,
    'to'        => 'example@sendgrid.com',
    'subject'   => 'test of file sends',
    'html'      => '<p> the HTML </p>',
    'text'      => 'the plain text',
    'from'      => 'example@sendgrid.com',
    'files['.$fileName.']' => '@'.$filePath.'/'.$fileName
  );
print_r($params);
$request =  $url.'api/mail.send.json';
// Generate curl request
$session = curl_init($request);
// Tell curl to use HTTP POST
curl_setopt ($session, CURLOPT_POST, true);
// Tell curl that this is the body of the POST
curl_setopt ($session, CURLOPT_POSTFIELDS, $params);
// Tell curl not to return headers, but do return the response
curl_setopt($session, CURLOPT_HEADER, false);
curl_setopt($session, CURLOPT_RETURNTRANSFER, true);
// obtain response
$response = curl_exec($session);
curl_close($session);
// print everything out
print_r($response);