Example
<?php
$sendgrid = new SendGrid("YOUR_SENDGRID_API_KEY");
$email = new SendGrid\Email();
$email->addTo("[email protected]")
->setFrom("[email protected]")
->setSubject("Subject Text")
->setText("This is a sample basic text email using ");
$attachment = '/path/to/your/file.pdf';
$content = file_get_contents($attachment);
$content = chunk_split(base64_encode($content));
$attachment = new Attachment();
$attachment->setContent($content);
$attachment->setType("application/pdf");
$attachment->setFilename("RenamedFile.pdf");
$attachment->setDisposition("attachment");
$email->addAttachment($attachment);
$sendgrid->send($email);
