Name: [name_field]

<?php
session_start();
// Checks to see that $_POST is set
if(isset($_POST['generate_email'])){

//Path to your exported RED email
$path_to_red_email = 'my_cool_email_exported/email.html';
$source = file_get_contents($path_to_red_email);

// Strings in RED to replace
$email_string = array(
"[first_name]",
"[last_name]",
"[pic_thumb]");

// First stage of replacing strings with $_GET varibles
$variables = array("<?php if(isset(xxxx_GET['first_name'])){echo xxxx_GET['first_name'] ;}?>",
"<?php if(isset(xxxx_GET['last_name'])){echo xxxx_GET['last_name'] ;}?>",
"<?php if(isset(xxxx_GET['pic_thumb'])){echo xxxx_GET['pic_thumb'] ;}?>"

);

// Path to generate the new email
$path_to_new_file1 = 'email/email-var-new.html';
$replaced_values = str_replace($email_string, $variables, $source);
file_put_contents($path_to_new_file1,$replaced_values);
$new_source = file_get_contents($path_to_new_file1);

// strings to search for
$email_string = array(
"xxxx");

// replace xxxx with $
$variables = array("$");

// path to finished email
$path_to_new_file2 = 'email/email.html';
$replaced_values = str_replace($email_string, $variables, $new_source);
file_put_contents($path_to_new_file2,$replaced_values);

// delete the unused first stage file
unlink($path_to_new_file1);
// generate a session var and redirect back to referer
$_SESSION['data'] = "Email Generated!";
header("Location: {$_SERVER['HTTP_REFERER']}");

}else{header('Location: ../index.php');}

?>

$message = file_get_contents('http://mydomain.com/email/email.html?first_name='.$first_name.'&last_name='.$last_name.'&pic_thumb='.$pic_thumb);