We recommend using SendGrid PHP, our client library, available on Github, with full documentation.

Using PHP with cURL

If you choose not to use SendGrid’s client library you may use PHP’s cURL function to query the web API.
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<?php

$url = 'https://api.sendgrid.com/';
$user = 'USERNAME';
$pass = 'PASSWORD';

$params = array(
    'api_user'  => $user,
    'api_key'   => $pass,
    'to'        => 'example3@sendgrid.com',
    'subject'   => 'testing from curl',
    'html'      => 'testing body',
    'text'      => 'testing body',
    'from'      => 'example@sendgrid.com',
  );


$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);

?>

An Email Sent Using the SMTPAPI Header

This example takes the previous example a step further by adding our SMTPAPI header to set a category and send out to multiple recipients. The category is called test_category, and the email will go out to both example1@sendgrid.com and example2@sendgrid.com. The normal to address, example3@sendgrid.com, will not receive an email.

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<?php

$url = 'https://api.sendgrid.com/';
$user = 'USERNAME';
$pass = 'PASSWORD';

$json_string = array(

  'to' => array(
    'example1@sendgrid.com', 'example2@sendgrid.com'
  ),
  'category' => 'test_category'
);


$params = array(
    'api_user'  => $user,
    'api_key'   => $pass,
    'x-smtpapi' => json_encode($json_string),
    'to'        => 'example3@sendgrid.com',
    'subject'   => 'testing from curl',
    'html'      => 'testing body',
    'text'      => 'testing body',
    'from'      => 'example@sendgrid.com',
  );


$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);

?>

An Email Sent Including a File Attachment

This example adds the additional attachment parameter to attach a file called myfile. This example assumes the file is in the same directory as your code otherwise you need to specify the full path of the file in the $filePath variable.

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<?php

$url = 'https://api.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);

?>