anti spam functie in script toevoegen

Part 1: The Contact Form

We are going to make a standard contact form with one extra feature: an input named “url” and a note beside it that says “Don’t type anything here!”

The HTML:
1 <form method="post" action="/submit.php">
2 <p>Your name:
3 <br /><input name="name" /></p>
4
5 <p>Your email:
6 <br /><input name="email" /></p>
7
8 <p class="antispam">Leave this empty:
9 <br /><input name="url" /></p>
10
11 <textarea name="message"></textarea>
12
13 <input type="submit" value="Send" />
14 </form>

Then we use CSS to hide the input and the note.

The CSS:
1 .antispam { display:none;}

Then we make a rule in the server that says ‘if the user typed anything in the “url” box, then throw it out.’

The PHP:
1 <?php
2
3 // if the url field is empty
4 if(isset($_POST['url']) && $_POST['url'] == ''){
5
6 // then send the form to your email
7 mail( '[email protected]', 'Contact Form', print_r($_POST,true) );
8 }
9
10 // otherwise, let the spammer think that they got their message through
11
12 ?>
13
14 <h1>Thanks</h1>
15 <p>We'll get back to you as soon as possible</p>

A regular person won’t even see the box normally, and will therefore leave it blank without even thinking about it. If the CSS fails to load, they get a note explaining what to do.

However, when a spam bot looks at this, it sees a good spot to stick whatever spammy url they’re trying to advertise.

Now the php script on the server can tell who is a spammer and who isn’t. The regular people get sent to your email, the spammers get ignored!