How do I send dynamic data to template file using sendgrid?

Hi I'm trying to send dynamic data to an external template file using sendgrid like this:

$sendgrid = new SendGrid(getenv('SENDGRID_KEY'));
$email = new SendGrid\Email();
$message_body = file_get_contents('../templates/emails/third-party-booking.php');

$email->addTo(getenv('SENDGRID_EMAIL'))
      ->setFrom("from@email.com")
      ->setSubject("Just a subject here")
      ->setHtml($message_body);

$sendgrid->send($email);

How do I send $details to the template, thanks!

Solution

If $detail contains some parameters that should be used in your template, you can do it on the $message_body step.

$sendgrid = new SendGrid(getenv('SENDGRID_KEY'));
$email = new SendGrid\Email();
$message_body = file_get_contents('../templates/emails/third-party-booking.php');
// $details = ['name'=>'Jean', 'email'=>'jean@gmail.com'];
// third-party-booking.php content be like 
// <html>...%name%.....%email%...</html>

foreach ($details as $parameter => $value) {
    $message_body= str_replace('%' . $parameter . '%', $value, $message_body);
}

$email->addTo(getenv('SENDGRID_EMAIL'))
      ->setFrom("from@email.com")
      ->setSubject("Just a subject here")
      ->setHtml($message_body);

$sendgrid->send($email);

There are no way to send data to a php file as it does a copy of the file content (see PHP - include a php file and also send query parameters)