PHP邮件说未定义的变量?
<?php
if(isset($_POST['submit'])){
$to = "ochrom@mail.com"; // this is your Email address
$from = $_POST['email']; // this is the sender's Email address
$first_name = $_POST['first_name'];
$company_name = $_POST['company_name'];
$phone = $_POST['phone'];
$message = $S_POST['message'];
$subject = "Form submission";
$message = $company_name . " " . $first_name . " wrote the following:" . "\n\n" . $_POST['message'];
$headers = "From:" . $from;
mail($to,$subject,$message,$headers);
echo "Mail Sent. Thank you " . $first_name . ", we will contact you shortly.";
// You can also use header('Location: thank_you.php'); to redirect to another page.
}
?>
<!DOCTYPE html>
<head>
<title>Form submission</title>
</head>
<body>
<form action="" method="post">
<h1>Brand Package</h1>
<br>
First Name: <input type="text" name="first_name"><br>
Company Name: <input type="text" name="company_name"><br>
Phone Number: <input type="text" name="phone"><br>
Email: <input type="text" name="email"><br>
Message:<br><textarea rows="5" name="message" cols="50" style = "width: 100%"></textarea><br>
<input type="submit" name="submit" value="Order">
</form>
</body>