Simple PHP Contact Form - 2 Days of Pain - php

Question

I have no real experience with PHP, and so have just pulled bits of code from various answers to help construct a simple PHP contact form. I have spent two days trying to work out why various variations aren't working. I've included my code:
HTML :
<section class="form-section" id="form-section">
<div class="row headline">
<h3>Free Quotation</h3> </div>
<div class="row">
<form action="mailer.php" method="post" name="htmlform" class="contact-form" target="_blank">
<div class="col span-1-of-2">
<div class="row inputs">
<label for="name">Name</label>
<input name="name" placeholder="Your name" required="" type="text"> </div>
<div class="row inputs">
<label for="email">Email</label>
<input name="email" placeholder="Your email" required="" value="" type="email" class="required email"> </div>
<div class="row inputs">
<label for="business_name">Business Name</label>
<input value="" name="business_name" placeholder="Your business name" required="" type="text" class=""> </div>
</div>
<div class="col span-1-of-2 message-box-container">
<label class="text-box-label" for="message">In a few words, what are you looking for?</label>
<textarea name="message" placeholder="Your message"></textarea>
</div>
<div class="row form-messages">
<?php
if($_GET['success'] == 1) {
echo "<div class="success">Thank You! We'll aim to follow up as soon as possible</div>";
}
if($_GET['success'] == -1) {
echo "<div class="error">Oops something went wrong, please try again</div>";
}
?> </div>
<div class="col span-2-of-3">
<div class="clear">
<input type="submit" value="Find Out More" name="subscribe" class="button"> </div>
</div>
</form>
</div>
</section>
This is my mailer.php form:
<?php
// Get the form fields, removes html tags and whitespace.
$name = strip_tags(trim($_POST["name"]));
$name = str_replace(array("\r","\n"),array(" "," "),$name);
$business_name = strip_tags(trim($_POST["business-name"]));
$business_name = str_replace(array("\r","\n"),array(" "," "),$business_name);
$email = filter_var(trim($_POST["email"]), FILTER_SANITIZE_EMAIL);
$message = trim($_POST["message"]);
// Check the data.
if (empty($name) empty($business_name) OR empty($message) OR !filter_var($email, FILTER_VALIDATE_EMAIL)) {
header("Location: http://www.thegreenbuddha.co.uk/index.php?success=-1#form");
exit;
}
// Set the recipient email address. Update this to YOUR desired email address.
$recipient = "chussell#thegreenbuddha.co.uk";
// Set the email subject.
$subject = "New contact from $name";
// Build the email content.
$email_content = "Name: $name\n";
$email_content .= "Email: $email\n\n";
$email_content .= "Message:\n$message\n";
$email_content .= "Business Name: $business_name \n";
// Build the email headers.
$email_headers = "From: $name <$email>";
// Send the email.
mail($recipient, $subject, $email_content, $email_headers);
// Redirect to the index.html page with success code
header("Location: http://www.thegreenbuddha.co.uk/index.php?success=1#form");
?>
When I have this on live preview both success and error messages display with PHP code. I have the file saved as a index.php. And when I submit it opens up the fresh page which is blank.
When I've added the new index.php and mailer.php to my cpanel, my website no longer displays!
Any suggestions or improvements?
Many thanks!

Answer 1

The following
<?php
if($_GET['success'] == 1) {
echo "<div class="success">Thank You! We'll aim to follow up as soon as possible</div>";
}
if($_GET['success'] == -1) {
echo "<div class="error">Oops something went wrong, please try gain</div>";
}
?>
Into
<?php
if($_GET['success'] == 1) {
echo '<div class="success">Thank You! We\'ll aim to follow up as soon as possible</div>';
}
if($_GET['success'] == -1) {
echo '<div class="error">Oops something went wrong, please try gain</div>';
}
?>
The following
if (empty($name) empty($business_name) OR empty($message) OR !filter_var($email, FILTER_VALIDATE_EMAIL)) {
header("Location: http://www.thegreenbuddha.co.uk/index.php?success=-1#form");
exit;
}
Into
if (empty($name) || empty($business_name) || empty($message) || !filter_var($email, FILTER_VALIDATE_EMAIL)) {
header("Location: http://www.thegreenbuddha.co.uk/index.php?success=-1#form");
exit;
}
Please change the following also:
$business_name = strip_tags(trim($_POST["business-name"]));
Into
$business_name = strip_tags(trim($_POST["business_name"]));