contact-form-handler.php

<?php

if (
  array_key_exists('first_name', $_POST) &&
  !preg_match('/^\s*$/', $_POST['first_name'])
) {
  if (
    array_key_exists('last_name', $_POST) &&
    !preg_match('/^\s*$/', $_POST['last_name'])
  ) {
    if (
      array_key_exists('phone_ac', $_POST) &&
      array_key_exists('phone_end', $_POST) &&
      array_key_exists('phone_mid', $_POST) &&
      preg_match('/^\d{3}$/', $_POST['phone_ac']) &&
      preg_match('/^\d{4}$/', $_POST['phone_end']) &&
      preg_match('/^\d{3}$/', $_POST['phone_mid'])
    ) {
      if (
        array_key_exists('email', $_POST) &&
        preg_match('/^.+\@.+\..{2,8}$/', $_POST['email'])
      ) {
        if (array_key_exists('unsecured_debt', $_POST)) {
          $_POST['first_name'] = str_replace(Array("\n", "\r"), '', $_POST['first_name']);
          $_POST['last_name'] = str_replace(Array("\n", "\r"), '', $_POST['last_name']);
          $_POST['email'] = str_replace(Array("\n", "\r"), '', $_POST['email']);
          mail(
            'leads@4pillarscalgary.ca',
            $_POST['first_name'] . ' ' . $_POST['last_name'] . ' is requesting a debt assessment.',
            'Name: ' . $_POST['first_name'] . ' ' . $_POST['last_name'] . "\r\n" .
            'E-Mail: ' . $_POST['email'] . "\r\n" .
            'Phone: ' . $_POST['phone_ac'] . '-' . $_POST['phone_mid'] . '-' . $_POST['phone_end'] . "\r\n\r\n" .
            "Unsecured Debt:\r\n" .
            $_POST['unsecured_debt'],
            'To: Leads <leads@4pillarscalgary.ca>' . "\r\n" .
            'From: ' . $_POST['first_name'] . ' ' . $_POST['last_name'] . ' <' . $_POST['email'] . '>' . "\r\n"
          );
          header('Location: index.html?sent');
        }
        else
          header('Location: index.html?error=5');
      }
      else
        header('Location: index.html?error=4');
    }
    else
      header('Location: index.html?error=3');
  }
  else
    header('Location: index.html?error=2');
}
else
  header('Location: index.html?error=1');

?>