Answer by bdsl for Send email with a template using php

Create your template file, e.g,

/path/to/templates/template.twig:

Dear {{name}},

Thank you for writing to us about {{subject}}.

Then follow the instructions at https://twig.symfony.com/doc/2.x/api.html to install and use the twig templating engine with Composer

require_once '/path/to/vendor/autoload.php';$loader = new Twig_Loader_Filesystem('/path/to/templates');$twig = new Twig_Environment($loader, array());

Then render and send your email:

$to = "someone@example.com";  $subject = "Test mail";  $message = $twig->render('template.twig', array('name' => 'Fred','subject' => 'philately',));$from = "someonelse@example.com";  $headers = "From: $from";  mail($to,$subject,$message,$headers);