A complete script that sends emails with attachments (built within the script itself) using the Web API

WebAPIatt.php

<?php
  // this is where file.txt is created and content is added.
  $my_file = 'file.txt';
  $handle = fopen($my_file, 'w') or die('Cannot open file:  '.$my_file);
  $data = 'This is the actual content of the text file.';
  fwrite($handle, $data);
 
        $url     = 'http://sendgrid.com/';
        $user    = '******';
        $pass    = '******';
        $to_addr = '[email protected]';
        $message = 'This is a message with an attachment.';
        $subject = 'Testare 4';
        $from    = '[email protected]';
        $html    = '<p>his is a message with an attachment.</p>';
         
        $params = array(
            'api_user'  => $user,
            'api_key'   => $pass,
            'to'        => $to_addr,
            'subject'   => $subject,
            'text'      => $message,
            'html'      => $html,  
            'from'      => $from,
            //The @ sign tells cURL that the file needs to be uploaded in the 'files' parameter
            'files[file.txt]' => '@file.txt'
        );
 
        $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, 0);
        curl_setopt($session, CURLOPT_RETURNTRANSFER, true);
        // obtain response
        $response = curl_exec($session);
        curl_close($session);
       
        print_r($response);
                       
        exit();
?>