Captcha - The Form
Captcha
A Captcha is used to cut down on spam. They are used to "hopefully" eliminated robots from filling out forms.For the form you need to add a label and input element before the submit button. I have given the input item the name "addition" which will match information within the php. You can use any set of numbers but the addition total must match the number given in the php.
<label>Anti-spam 10 + 12 =</label>
<input name="addition">
Form with Captcha (form information on previous page)
<form id="myForm" method="post" action="address.php">
<label>Subject</label>
<input type="text" name="subject" required>
<label>Name</label>
<input type="text" name="name" required>
<label>Email</label>
<input type="email" name="email" required>
<label>Your Comments</label>
<textarea type="text" name="comments" required> </textarea>
//include for anti-spam
<label>Anti-spam 10 + 12 =</label>
<input name="addition">
<input type="submit" name="submit" id="submit" value="SUBMIT" />
</form>
Captcha - Server Side
add captcha to your prevously created server side script.Script
<?php$name = $_POST['name'];
$email = $_POST['email'];
$comments= $_POST['comments'];
$headers = "From: $email \r\n";
$to = 'name@company.com';
$subject = 'subject line';
//added to match the input element in the form
$addition = $_POST['addition'];
$body = "From: $name\n E-Mail: $email\n Comments:\n $comments";
//make sure that you have the same name as that of the input element and the total for the addition
if ($_POST['submit'] && $addition == '22') {
//The information for mail and header is the same as before except it has been placed in the lf statement:
if (mail ($to, $subject, $body, $headers)) {
header( "Location: name.htm" );
//the next statement is to test your form
} else {
echo '<p>Something is incorrect, hit the back button and try again!</p>';
}
//this statement tests whether or not the user has the correct answer for the addition
} else if ($_POST['submit'] && $addition!= '22') {
echo '<p>You answered the anti-spam question incorrectly hit the back button and try again!</p>';
}
?>
Script without Comments
<?php
$name = $_POST['name'];
$email = $_POST['email'];
$comments= $_POST['comments'];
$headers = "From: $email \r\n";
$to = 'name@company.com';
$subject = 'subject line';
$addition = $_POST['addition'];
$body = "From: $name\n E-Mail: $email\n Comments:\n $comments";
if ($_POST['submit'] && $addition == '22') {
if (mail ($to, $subject, $body, $headers)) {
header( "Location:name.htm" );
} else {
echo 'Something is incorrect, hit the back button and try again!';
}
} else if ($_POST['submit'] && $addition!= '22') {
echo 'You answered the anti-spam question incorrectly hit the back button and try again!';
}
?>