send mail using gmail api use php example

<?php 

// Download the library from GitHub: URL: https://github.com/google/google-api-php-client
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require 'vendor/autoload.php';

session_start();

//$youtube_api_key = 'MY_KEY';

$oauth_client_id = 'xxxxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com';

$oauth_client_secret = 'xxxxxxxxxxxxxxxxxxxxxxx';

define('SCOPES', implode(' ', array(

  Google_Service_Gmail::GMAIL_READONLY,Google_Service_Gmail::GMAIL_COMPOSE,'https://mail.google.com','https://www.googleapis.com/auth/gmail.compose','https://www.googleapis.com/auth/gmail.modify','https://www.googleapis.com/auth/gmail.send')

));

//$client = new \Google_Client();

//$client->setDeveloperKey($youtube_api_key);

$client = new Google_Client();

$client->setClientId($oauth_client_id); 

$client->setClientSecret($oauth_client_secret);

$client->setScopes(SCOPES);

$redirect = filter_var('http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'], FILTER_SANITIZE_URL);

$client->setRedirectUri($redirect);

$client->setAccessType('offline');  

$tokenSessionKey = 'token-' . $client->prepareScopes();

if (isset($_GET['code'])) {

  if (strval($_SESSION['state']) !== strval($_GET['state'])) {

    die('The session state did not match.');

  }

  $client->authenticate($_GET['code']);

  $_SESSION[$tokenSessionKey] = $client->getAccessToken();

  header('Location: ' . $redirect);

}

if (isset($_SESSION[$tokenSessionKey])) {

  $client->setAccessToken($_SESSION[$tokenSessionKey]);

}

$message  = "MIME-Version: 1.0\r\n";

$message .= "From: FromName <frommail@gmail.com>\r\n";

$message .= "To: Pavan <pavan9212@gmail.com>\r\n";

$message .= "Subject: =?utf-8?B?".base64_encode('Sample Subject Which Contains Non-Latin Characters'.date(DATE_RFC2822))."?=\r\n";

$message .= "Date: ".date(DATE_RFC2822)."\r\n"; 

$message .= "Content-Type: multipart/alternative; boundary=test\r\n\r\n";

$message .= "--test\r\n";

$message .= "Content-Type: text/plain; charset=UTF-8\r\n";

$message .= "Content-Transfer-Encoding: base64\r\n\r\n";

$message .= base64_encode('Sample email message which contains non-latin chcracters')."\r\n";

// The message needs to be encoded in Base64URL

$mime = rtrim(strtr(base64_encode($message), '+/', '-_'), '=');

$service = new \Google_Service_Gmail($client);

$msg = new \Google_Service_Gmail_Message();

$msg->setRaw($mime);

try {

    if ($client->getAccessToken()) {

        $results = $service->users_messages->send("me", $msg);

print 'Message with ID: ' . $results->id . ' sent.';

    } else {

        // If the user hasn't authorized the app, initiate the OAuth flow

        $state = mt_rand();

        $client->setState($state);

        $_SESSION['state'] = $state;

        $authUrl = $client->createAuthUrl();

        $htmlBody = <<<END

<h3>Authorization Required</h3>

<p>You need to <a href="$authUrl">authorize access</a> before proceeding.<p>

END;

        echo $htmlBody;

    }

} catch (\Google_Service_Exception $e) {

    $gse_errors = $e->getErrors();

    echo '<h1>error!</h1>';

    echo '<pre>'.print_r($gse_errors, true).'</pre>';

}

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