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PHP form processing error
$email_to = "email@example.ca"; //with this being my actual recipient email address
$email_subject = "New Customer Quote";


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($_POST['firstName']) ||
    !isset($_POST['lastName']) ||
    !isset($_POST['email']) ||
    !isset($_POST['homePhone'])) {
    died('We are sorry, but there appears to be a problem with the form you submitted.');
}

$first_name = $_POST['firstName']; // required
$last_name = $_POST['lastName']; // required
$email_from = $_POST['email']; // required
$telephone = $_POST['homePhone']; // not required
$otherPhone = $_POST['altPhone'];
$address = $_POST['address'];

$care = "No";
$walk = "No";
$buddy = "No";
$visit = "No";
$overnight = "No";
$board = "No";

$monday = "No";
$sunday = "No";
$tuesday = "No";
$wednesday = "No";
$thursday = "No";
$friday = "No";
$saturday = "No";

if($_POST['care'] == "Pet/House Care") {
$care = "Yes";
}
if($_POST['private'] == "Private Dog Walking") {
$walk = "Yes";
}
if($_POST['buddy'] == "Buddy Walks") {
$buddy = "Yes";
}
if($_POST['puppy'] == "Puppy Visits") {
$visit = "Yes";
}
if($_POST['night'] == "Overnight Stays") {
$overnight = "Yes";
}
if($_POST['board'] == "Boarding") {
$board = "Yes";
}

if($_POST['sun'] == "Sunday") {
$sunday = "Yes";
}
if($_POST['mon'] == "Monday") {
$monday = "Yes";
}
if($_POST['tues'] == "Tuesday") {
$tuesday = "Yes";
}
if($_POST['wed'] == "Wednesday") {
$wednesday = "Yes";
}
if($_POST['thurs'] == "Thursday") {
$thursday = "Yes";
}
if($_POST['fri'] == "Friday") {
$friday = "Yes";
}
if($_POST['sat'] == "Saturday") {
$saturday = "Yes";
}


$firstDate = $_POST['firstDate'];
$firstTime1 = $_POST['1time1'];
$firstDur1 = $_POST['q9_durationOf9'];

$firstTime2 = $_POST['1time2'];
$firstDur2 = $_POST['q11_durationOf'];

$firstTime3 = $_POST['1time3'];
$firstDur3 = $_POST['q13_durationOf13'];


$secondTime1 = $_POST['2time1'];
$secondDur1 = $_POST['q15_durationOf15'];

$secondTime2 = $_POST['2time2'];
$secondDur2 = $_POST['q17_durationOf17'];

$secondTime3 = $_POST['2time3'];
$secondDur3 = $_POST['q19_durationOf19'];


$lastDate = $_POST['endDate'];
$thirdTime1 = $_POST['3time1'];
$thirdDur1 = $_POST['q22_durationOf22'];

$thirdTime2 = $_POST['3time2'];
$thirdDur2 = $_POST['q24_durationOf24'];

$thirdTime3 = $_POST['3time3'];
$thirdDur3 = $_POST['q26_durationOf26'];


$petNum = $_POST['howMany'];
$pet1 = $_POST['firstPet'];
$breed1 = $_POST['1breed'];
$pet2 = $_POST['secondPet'];
$breed2 = $_POST['2breed'];
$pet3 = $_POST['thirdPet'];
$breed3 = $_POST['3breed'];
$pet4 = $_POST['fourthPet'];
$breed4 = $_POST['4breed'];

$key = $_POST['key'];
$how = $_POST['howDid'];

$comments = $_POST['addlComments'];


$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)) {
$error_message .= 'The First Name you entered does not appear to be valid.<br />';
}
if(!preg_match($string_exp,$last_name)) {
$error_message .= 'The Last Name you entered does not appear to be valid.<br />';
}
if(strlen($error_message) > 0) {
died($error_message);
}
$email_message = "Form details below.nn";

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";
$email_message .= "Last Name: ".clean_string($last_name)."n";
$email_message .= "Email: ".clean_string($email_from)."n";
$email_message .= "Telephone: ".clean_string($telephone)."nn";

$email_message .= "Pet/House Care: ".clean_string($care)."n";
$email_message .= "Private Walk: ".clean_string($walk)."n";
$email_message .= "Buddy Walk: ".clean_string($buddy)."n";
$email_message .= "Puppy Visit: ".clean_string($visit)."n";
$email_message .= "Overnight: ".clean_string($overnight)."n";
$email_message .= "Boarding: ".clean_string($board)."nn";

$email_message .= "On: nSunday: ".clean_string($sunday)."n";
$email_message .= "Monday: ".clean_string($monday)."n";
$email_message .= "Tuesday: ".clean_string($tuesday)."n";
$email_message .= "Wednesday: ".clean_string($wednesday)."n";
$email_message .= "Thursday: ".clean_string($thursday)."n";
$email_message .= "Friday: ".clean_string($friday)."n";
$email_message .= "Saturday: ".clean_string($saturday)."nn";

$email_message .= "First Date: ".clean_string($firstDate)."n";
$email_message .= "Time: ".clean_string($firstTime1)."n";
$email_message .= "Duration: ".clean_string($firstDur1)."nn";

$email_message .= "Second Time: ".clean_string($firstTime2)."n";
$email_message .= "Duration: ".clean_string($firstDur2)."nn";

$email_message .= "Third Time: ".clean_string($firstTime3)."n";
$email_message .= "Duration: ".clean_string($firstDur3)."nn";

$email_message .= "Time: ".clean_string($secondTime1)."n";
$email_message .= "Duration: ".clean_string($secondDur1)."nn";

$email_message .= "Second Time: ".clean_string($secondTime2)."n";
$email_message .= "Duration: ".clean_string($secondDur2)."nn";

$email_message .= "Third Time: ".clean_string($secondTime3)."n";
$email_message .= "Duration: ".clean_string($secondDur3)."nn";

$email_message .= "Last Date: ".clean_string($lastDate)."n";
$email_message .= "Time: ".clean_string($thirdTime1)."n";
$email_message .= "Duration: ".clean_string($thirdDur1)."nn";

$email_message .= "Second Time: ".clean_string($thirdTime2)."n";
$email_message .= "Duration: ".clean_string($thirdDur2)."nn";

$email_message .= "Third Time: ".clean_string($thirdTime3)."n";
$email_message .= "Duration: ".clean_string($thirdDur3)."nn";

$email_message .= "How Many Pets: ".clean_string($petNum)."nn";

$email_message .= "First Pet: ".clean_string($pet1)."n";
$email_message .= "Breed: ".clean_string($breed1)."nn";

$email_message .= "Second Pet: ".clean_string($pet2)."n";
$email_message .= "Breed: ".clean_string($breed2)."nn";

$email_message .= "Third Pet: ".clean_string($pet3)."n";
$email_message .= "Breed: ".clean_string($breed3)."nn";

$email_message .= "Fourth Pet: ".clean_string($pet4)."n";
$email_message .= "Breed: ".clean_string($breed4)."nn";

$email_message .= "KeyCare: ".clean_string($key)."n";
$email_message .= "How Did you Hear: ".clean_string($how)."n";
$email_message .= "Additional Comments: ".clean_string($comments)."n";


// create email headers
$headers = 'From: '.$email_from."rn".
'Reply-To: '.$email_from."rn" .
'X-Mailer: PHP/' . phpversion();
@mail($email_to, $email_subject, $email_message, $headers);
?>

<!-- include your own success html here -->

Thank you for contacting us. We will be in touch with you very soon.

<?php
}
?>`