send-email.php

<?php

/**
 * Quick utility script to send email out ... before you send this out,
 * run this to load up the Sendgrid API key into your environment:
 * source ./sendgrid.env
 *
 * Also, this code uses composer and the sendgrid/sendgrid library:
 *   composer require sendgrid/sendgrid
 */


require 'vendor/autoload.php';

$fh = fopen('contacts.csv', 'r');
$header = fgetcsv($fh);
$all_rows = [];
while ($row_data = fgetcsv($fh)) {
  $row = array_combine($header, $row_data);
  $all_rows[] = $row;
}
fclose($fh);

$chunks = array_chunk($all_rows, 1000);
$sent = $chunk_num = 0;
foreach ($chunks as $chunk) {
  echo "Sending chunk #$chunk_num...\n";
  $request_body = [
    'from' => [
      'email' => 'do-not-reply@example.com',
      'name' => 'John Smith',
    ],
    'template_id' => 'c89a108f-6175-e76e-c806-5f193b336dbc',
    'subject' => 'SUBJECT LINE GOES HERE',
    'reply_to' => [
      'email' => 'me@example.com',
      'name' => 'John Smith',
    ],
    'categories' => [
      'category_name',
    ],
    'tracking_settings' => [
      'ganalytics' => [
        'enable' => TRUE,
        'utm_source' => 'UTMSOURCE',
        'utm_medium' => 'email',
        'utm_campaign' => 'UTMCAMPAIGN',
      ],
    ],
    // Uncomment below to just send the request and see if the data structure is legit.
    // 'mail_settings' => [
    //   'sandbox_mode' => [
    //     'enable' => TRUE,
    //   ],
    // ],
  ];
  $personalizations = [];
  foreach ($chunk as $row) {
    $url = $row['login_url'];
    $email = trim(strtolower($row['email']));
    $personalization = [
      'to' => [
        ['email' => $email],
      ],
      'substitutions' => [
        '-url-' => $url,
        '-fname-' => $row['fname'],
      ],
    ];
    $personalizations[] = $personalization;
    $sent++;
  }

  $request_body['personalizations'] = $personalizations;

    // print_r($request_body);

  $apiKey = getenv('SENDGRID_API_KEY');
  $sg = new \SendGrid($apiKey);
  $response = $sg->client->mail()->send()->post($request_body);
  echo $response->statusCode();
  echo $response->body();
  print_r($response->headers());
  $chunk_num++;
}

printf("All done - sent %s emails total.\n", number_format($sent));