Php, how to send a confirmation mail after form submission - php

Question

Hi there and thank you very much for your help in advance!
I'd like to send a custom confiramtion email to a user after form submission.
I have no idea how to set this up in my php file. I am a very beginner - sorry for a nooby question :-/
Thanks!!
<?php
if(isset($_POST['email'])) {
// CHANGE THE TWO LINES BELOW
$email_to = "christian#diamond-precision-studio.com";
$email_subject = "website html form submissions";
function died($error) {
// your error code can go here
echo "We are very sorry, but there were error(s) found with the form you submitted. ";
echo "These errors appear below.<br /><br />";
echo $error."<br /><br />";
echo "Please go back and fix these errors.<br /><br />";
die();
}
// validation expected data exists
if(!isset($_POST['first_name']) ||
!isset($_POST['email']) ||
!isset($_POST['budget']) ||
!isset($_POST['message'])) {
died('We are sorry, but there appears to be a problem with the form you submitted.');
}
$first_name = $_POST['first_name']; // required
$email_from = $_POST['email']; // required
$budget = $_POST['budget']; // not required
$message = $_POST['message']; // required
$error_message = "";
$email_exp = '/^[A-Za-z0-9._%-]+#[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
if(!preg_match($email_exp,$email_from)) {
$error_message .= 'The Email Address you entered does not appear to be valid.<br />';
}
$string_exp = "/^[A-Za-z .'-]+$/";
if(!preg_match($string_exp,$first_name)) {
$error_message .= 'The First Name you entered does not appear to be valid.<br />';
}
if(strlen($message) < 2) {
$error_message .= 'The Comments you entered do not appear to be valid.<br />';
}
if(strlen($error_message) > 0) {
died($error_message);
}
$email_message = "Form details below.\n\n";
function clean_string($string) {
$bad = array("content-type","bcc:","to:","cc:","href");
return str_replace($bad,"",$string);
}
$email_message .= "First Name: ".clean_string($first_name)."\n";
$email_message .= "Email: ".clean_string($email_from)."\n";
$email_message .= "Budget: ".clean_string($budget)."\n";
$email_message .= "Message: ".clean_string($message)."\n";
// create email headers
header( "Location: https://www.diamond-precision-studio.com/new-website/thank-you.html" );
$headers = 'From: '.$email_from."\r\n".
'Reply-To: '.$email_from."\r\n" .
'X-Mailer: PHP/' . phpversion();
#mail($email_to, $email_subject, $email_message, $headers);
?>
<!-- place your own success html below -->
<?php
}
die();
?>

Answer 1

this line:
header( "Location: https://www.diamond-precision-studio.com/new-website/thank-you.html" );
will redirect your script to another page BEFORE you call mail function. It means, mail will never be executed. So, remove it.