Two Page Form Submits On First Page - php

Question

I am trying to create a two page form- the first page is optional. Its a prompt to get started. It was working perfectly until I started adding in PHPMailer. Now when I click submit on the first, optional form on the first page it submits it through the mailer and all its validations/errors then emails correctly it if I comment out the error if statements.
Here is the first form that is optional. It should take you to the estimate page with those values stored in the form already so you don't have to do it over again.
<form class="form-horizontal first-form" action="estimate.php" method="post">
<div class="form-group">
<label for="inputMoveDate" class="col-xs-4 text-left">Move Date</label>
<div class="col-xs-8">
<input type="text" name="date" class="form-control" id="datepicker">
</div><!--col-xs-7-->
</div><!--form-group-->
<div class="form-group">
<label for="pickUpZip" class="col-xs-4">Pick Up Zip</label>
<div class="col-xs-8">
<input type="text" name="pickUpZip" class="form-control" id="pickUpZip" placeholder="">
</div><!--col-xs-7-->
</div><!--form-group-->
<div class="form-group">
<label for="dropOffZip" class="col-xs-4">Drop Off Zip</label>
<div class="col-xs-8">
<input type="text" name="dropOffZip" class="form-control" id="dropOffZip" placeholder="">
</div><!--col-xs-7-->
</div><!--form-group-->
<div class="form-group">
<div class="col-xs-12">
<button type="submit" class="btn btn-default center-block">Continue</button>
</div><!--col-sm-offset-2-->
</div><!--form-group-->
</form>
Estimate.php second page. The PHP at the top of the document.
session_start();
if ($_SERVER["REQUEST_METHOD"]=="POST") {
$date = $_POST['date'];
$pickUpZip = $_POST['pickUpZip'];
$dropOffZip = $_POST['dropOffZip'];
$dwellingType = $_POST['dwellingType'];
$salutation = $_POST['salutation'];
$firstName = trim(filter_input(INPUT_POST, "first-name", FILTER_SANITIZE_STRING));
$lastName = trim(filter_input(INPUT_POST, "last-name", FILTER_SANITIZE_STRING));
$email = trim(filter_input(INPUT_POST, "email", FILTER_SANITIZE_SPECIAL_CHARS));
$phone = $_POST['phone'];
$pickUpAddress = $_POST['pickUpAddress'];
$pickUpCity = $_POST['pickUpCity'];
$pickUpState = $_POST['pickUpState'];
$comments = $_POST['comments'];
$emailBody ="From: $salutation $firstName $lastName\n
Phone Number: $phone\n
E-Mail: $email\n
Message:\n $comments
\n \n
Move Date: $date\n
Pick Up Address: $pickUpAddress\n
Pick Up City: $pickUpCity\n
Pick Up State: $pickUpState\n
Pick Up Zip: $pickUpZip\n
\n
Drop Off Zip: $dropOffZip\n
Dwelling Type: $dwellingType\n";
if($firstName == "" || $email == "" || $lastName == "") {
echo "Please fill in the required forms: first name, last name, and email.";
exit;
}
if ($_POST["address"] != "") {
echo "Bad form input";
exit;
}
require('phpmailer/class.phpmailer.php');
$mail = new PHPMailer;
if (!$mail->ValidateAddress($email)) {
echo 'Invalid email. Try again.';
exit;
}
$mail->setFrom($email, $firstName);
$mail->addAddress('xxxx#xxx.com', 'name here');
$mail->isHTML(false);
$mail->Subject = 'Estimate Request Inquiry From ' . $firstName;
$mail->Body = $emailBody;
if(!$mail->send()) {
echo 'Message could not be sent.';
echo 'Mailer Error: ' . $mail->ErrorInfo;
exit;
}
header("location:estimate.php?status=thanks");
}
Here is the starting and ending of the form HTML, the highlights.
<?PHP
if (isset($_GET["status"]) && $_GET["status"] == "thanks") {
echo "Thank you for your estimate request. We will return your inquiry soon!
</div>";
} else {
?>
<form class="form-horizontal first-form" action="estimate.php" method="post" style="margin: 0 45px;">
<label for="date" class="col-xs-4 text-left">Move Date</label>
<div class="col-xs-8">
<input type="text" class="form-control" id="datepicker" name="date" value="<?php echo $_POST["date"]; ?>">
</div><!--col-xs-7-->
</div><!--form-group-->
<div class="form-group">
<label for="pickUpZip" class="col-xs-4">Pick Up Zip</label>
<div class="col-xs-8">
<input type="text" name="pickUpZip" class="form-control" id="pickUpZip" value="<?php echo $_POST["pickUpZip"]; ?>">
</div><!--col-xs-7-->
</div><!--form-group-->
<div class="form-group">
<label for="dropOffZip" class="col-xs-4">Drop Off Zip</label>
<div class="col-xs-8">
<input type="text" name="dropOffZip" class="form-control" id="dropOffZip" value="<?php echo $_POST["dropOffZip"]; ?>">
</div><!--col-xs-7-->
</div><!--form-group-->
<div class="col-xs-12">
<button type="submit" id="submit" name="submit" class="btn btn-default center-block">Submit</button>
</div><!--col-sm-offset-2-->
</div><!--form-group-->
</form>
<?PHP
}
?>

Answer 1

This line attempts to send the email every time:
if(!$mail->send()) {
and your error messages are echoed if and when it fails.
You should nest this entire block in an if statement that checks if the form was submitted from page 2. You can give the submit button a different value and check that (i.e. 'submit1', 'submit2').