v3 "Hello World" for email, using SendGrid with PHP.

v3-hello-email.php

<?php
require 'vendor/autoload.php'; // If you're using Composer (recommended)
// Comment out the above line if not using Composer
// require("<PATH TO>/sendgrid-php.php");
// If not using Composer, uncomment the above line and
// download sendgrid-php.zip from the latest release here,
// replacing <PATH TO> with the path to the sendgrid-php.php file,
// which is included in the download:
// https://github.com/sendgrid/sendgrid-php/releases

$email = new \SendGrid\Mail\Mail(); 
$email->setFrom("test@example.com", "Example User");
$email->setSubject("Sending with SendGrid is Fun");
$email->addTo("test@example.com", "Example User");
$email->addContent("text/plain", "and easy to do anywhere, even with PHP");
$email->addContent(
    "text/html", "<strong>and easy to do anywhere, even with PHP</strong>"
);
$sendgrid = new \SendGrid(getenv('SENDGRID_API_KEY'));
try {
    $response = $sendgrid->send($email);
    print $response->statusCode() . "\n";
    print_r($response->headers());
    print $response->body() . "\n";
} catch (Exception $e) {
    echo 'Caught exception: '. $e->getMessage() ."\n";
}

@ashwin31:
Try this

$file_to_attach = 'path/to/file.pdf';
$file_encoded = base64_encode(file_get_contents($file_to_attach));

$attachment = new SendGrid\Attachment();
$attachment-> setContent($file_encoded); //You need BASE64 encoding for your file
$attachment-> setType("application/pdf");
$attachment-> setDisposition("attachment");
$attachment-> setFilename("myFile.pdf");
$attachment-> setContentId("quote");

$mail->addAttachment($attachment);

Let me know how it goes!

replace
$attachment = new SendGrid\Attachment();
with
$attachment = new SendGrid\Mail\Attachment();