Takes data from a from and creates and email, also adds an attachment.

simple-capture-form.php

<?php
/**
 * Simple Capture Form
 *
 * <input type="hidden" name="first_name" value="" />
 * <input type="hidden" name="form_submitted" value="true" />
 *
 * May need to consider using https://github.com/PHPMailer/PHPMailer
 * with an SMTP server if mail from this form goes to spam folder
 */

/* Email header vars */
$to = "Accounts <accounts@website.com.au>";
$from = "Enquiries <enquiries@website.com.au>";
$replyTo = "Reply-To <reply-to@website.com.au>";
$subject = "form submission";

/* Legit email validation vars */
$request_method_is_post = $_SERVER['REQUEST_METHOD'] == 'POST';
$form_was_summitted = isset($_POST['formSubmitted']);
$user_is_human = isset($_POST['isHuman']) && !$_POST['isHuman'];

if ($request_method_is_post && $form_was_summitted && $user_is_human) {
  /* Email content vars */
  $name = (isset($_POST['name'])) ? trim(htmlentities(strip_tags($_POST['name']))) : false;
  $email = (isset($_POST['email'])) ? trim(htmlentities(strip_tags($_POST['email']))) : false;
  $phoneNumber = (isset($_POST['phone'])) ? trim(htmlentities(strip_tags($_POST['contact']['phone']))) : false;
  $employer = (isset($_POST['employer'])) ? trim(htmlentities(strip_tags($_POST['employer']))) : false;

  /**
   * Build the email
   */
  if($name && $email && $phoneNumber && $employer) {
    $body_content = array(
      "Great news! You have an email from $name.",
      "They can be contacted via email: $email, or phone: $phoneNumber",
      "The employer the listed was: $employer"
    );

    $body = implode('<br />', $body_content);

    $headers = array(
      "MIME-Version: 1.0",
      "Content-Type: text/html; charset=iso-8859-1",
      "From: {$from}",
      "Reply-To: {$replyTo}",
      "X-Mailer: PHP/" . phpversion()
    );

    /**
     * Attempt to send mail
     */
    $send_mail = mail($to, $subject, $body, implode("\r\n", $headers));

    if ($send_mail) {
      $feedback_message = 'Thank you for your enquiry!';
      $feedback_type = 'success';
      http_response_code(200);
    } else {
      $feedback_message = 'Sorry, there was an problem submitting your enquiry';
      $feedback_type = 'failed';
      http_response_code(500);
    }
  } else {
    $feedback_message = 'Please ensure you input all your details';
    $feedback_type = 'failed';
    http_response_code(403);
  }
} else {
  $feedback_message = 'Sorry, there was an problem submitting your enquiry';
  $feedback_type = 'failed';
  http_response_code(403);
}

$output = json_encode(array('type' => $feedback_type, 'text' => $feedback_message));
exit($output);