Learn how to handle web form submissions using PHP and validate user input.
<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
$firstName = filter_var($_POST['firstName'], FILTER_SANITIZE_STRING);
$lastName = filter_var($_POST['lastName'], FILTER_SANITIZE_STRING);
$company = filter_var($_POST['company'], FILTER_SANITIZE_STRING);
$address = filter_var($_POST['address'], FILTER_SANITIZE_STRING);
$city = filter_var($_POST['city'], FILTER_SANITIZE_STRING);
$state = filter_var($_POST['state'], FILTER_SANITIZE_STRING);
$zip = filter_var($_POST['zip'], FILTER_SANITIZE_STRING);
$email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);
$telephone = filter_var($_POST['telephone'], FILTER_SANITIZE_STRING);
$comments = filter_var($_POST['comments'], FILTER_SANITIZE_STRING);
$errors = array();
if (0 === preg_match("/\S+/", $firstName)) {
$errors['firstName'] = "Please enter a first name.";
}
if (0 === preg_match("/\S+/", $lastName)) {
$errors['lastName'] = "Please enter a last name.";
}
if ($firstName == $lastName) {
if (!empty($firstName) || !empty($lastName)) {
$errors[] = "First and last names can not match.";
}
}
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
$errors['email'] = "Please enter a valid email address.";
}
if (!empty($errors)) {
?><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style type="text/css">
.error-list {
width: 475px;
margin: 50px auto 0;
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
text-align: center;
}
ul {
margin: 50px 0;
}
li {
color: red;
font-weight: bold;
}
.notice {
font-size: 18px;
text-transform: uppercase;
}
.action {
font-weight: bold;
}
</style>
<title>Your form has errors!</title>
</head>
<body>
<div class="error-list">
<p class="notice">Your form contained the following errors:</p>
<ul>
<?php foreach($errors as $error) { ?>
<li><?php echo($error) ?></li>
<?php } ?>
</ul>
<p class="action">Press your browser's back button to correct your entries.</p>
</div>
</body>
</html><?php
} else {
$headers = array();
$headers[] = 'MIME-Version: 1.0';
$headers[] = 'Content-type: text/html; charset=iso-8859-1';
$headers[] = 'X-Mailer: PHP/' . phpversion();
$headers[] = 'From: NAME <example@example.com>';
$headers[] = "Reply-To: {$name} <{$email}>";
$to = array();
$to[] = "exmaple@example.com";
$to[] = "exmaple2@example.com";
$subject = "EMAIL SUBJECT HERE";
$message = <<<EOD
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Message Title</title>
</head>
<body>
<table width="99%" border="0" cellpadding="1" cellspacing="0" bgcolor="#EAEAEA">
<tr>
<td>
<table width="100%" border="0" cellpadding="5" cellspacing="0" bgcolor="#FFFFFF">
<tr bgcolor="#EAF2FA">
<td colspan="2">
<font style="font-family: sans-serif; font-size:12px;"><strong>Name</strong></font>
</td>
</tr>
<tr bgcolor="#FFFFFF">
<td width="20"> </td>
<td>
<font style="font-family: sans-serif; font-size:12px;">$firstName $lastName</font>
</td>
</tr>
<tr bgcolor="#EAF2FA">
<td colspan="2">
<font style="font-family: sans-serif; font-size:12px;"><strong>Email</strong></font>
</td>
</tr>
<tr bgcolor="#FFFFFF">
<td width="20"> </td>
<td>
<font style="font-family: sans-serif; font-size:12px;"><a href="mailto:$email">$email</a></font>
</td>
</tr>
<tr bgcolor="#EAF2FA">
<td colspan="2">
<font style="font-family: sans-serif; font-size:12px;"><strong>Phone</strong></font>
</td>
</tr>
<tr bgcolor="#FFFFFF">
<td width="20"> </td>
<td>
<font style="font-family: sans-serif; font-size:12px;">$telephone</font>
</td>
</tr>
<tr bgcolor="#EAF2FA">
<td colspan="2">
<font style="font-family: sans-serif; font-size:12px;"><strong>Address</strong></font>
</td>
</tr>
<tr bgcolor="#FFFFFF">
<td width="20"> </td>
<td>
<font style="font-family: sans-serif; font-size:12px;">$address<br/>$city, $state $zip</font>
</td>
</tr>
<tr bgcolor="#EAF2FA">
<td colspan="2">
<font style="font-family: sans-serif; font-size:12px;"><strong>Comments</strong></font>
</td>
</tr>
<tr bgcolor="#FFFFFF">
<td width="20"> </td>
<td>
<font style="font-family: sans-serif; font-size:12px;">$comments</font>
</td>
</tr>
</table>
</td>
</tr>
</table>
</body>
</html>
EOD;
$sent = mail(implode(',', $to), $subject, $message, implode("\r\n", $headers));
if ($sent) {
header('Location: thank-you.php');
} else {
echo "Mail failed to send.";
}
}
} ?>
