Help with fill-in form?

Hey!

Well, I'm really new to coding and I'm stuck. I've recently created a fill-in form for my website and there are a few things I would like to fix but don't know how.

So far, all i have is a notice that says "Please submit a valid email address" (all it does is check if there is an "@" symbol and things like that) but i would like it to check if it is a registered/working email address as well.
Is there also a way of making sure that all of the fields in the form are filled in, before submission?

Also, is there a way of knowing if the "person/thing" on the other side that is entering the information into my form is really a person, and not some coded web robot or something?

Since my code is too long to fit into this box, here's the link to my webpage:
http://www.leopoldine-jpm.com/ttorder.htm

can someone please help me?

Try this:
http://www.captcha.net/

thank you! ^_^

but now im stuck because i don't know where to put what. >.<
My form is an HTML document with PHP working in the background. it's not PHP inside an HTML document.

http://recaptcha.net/plugins/php/

okay. so after fiddling around with the codes, i finally managed to get the reCAPTCHA thingy working.

but how about:

Quote:

---

So far, all i have is a notice that says "Please submit a valid email address" (all it does is check if there is an "@" symbol and things like that) but i would like it to check if it is a registered/working email address as well.
Is there also a way of making sure that all of the fields in the form are filled in, before submission?

---

These might be helpful:
http://www.codewalkers.com/c/a/Email-Code/Checking-if-Email-address-is-deliverable/
http://search.cpan.org/~rjbs/Email-Valid-0.179/lib/Email/Valid.pm
http://authors.aspalliance.com/aspxtreme/abkd/script/valid_input.aspx

This doesn't check if the email exists but it should validate it:

PHP Code:

---

function is_valid_email($email){
   if(preg_match("/[a-zA-Z0-9_\-.+]+@[a-zA-Z0-9-]+.[a-zA-Z]+/", $email) > 0){
      return true;
   }else{
      return false;
   }
} 


---

[edit]
Here's a code to see if the myemail@gmail.com is a valid(the site):

PHP Code:

---

function is_real_site($email){
   $email = preg_split("/[@]+/", $email);
   $ip = $email[1];
   exec("ping -n 4 $ip 2>&1", $output, $retval);
   if ($retval != 0) { 
      $check = false;
   } else { 
      $check = true;
   }
   return $check;
} 


---

If so the function will return "1."
Inspired by: http://www.dynamicdrive.com/forums/s...85&postcount=1

Edit: BUG IN ABOVE CODE! Someone could type: shutdown in the email address, and the server would shut down.

well so far, i've got this checking the email address and it's doin a pretty good job at it:

PHP Code:

---

<script language="JavaScript" type="text/javascript">
 function validateForm(order)
 {
        //oForm refers to the form which you want to validate
        order.onsubmit = function() // attach the function to onsubmit event
        {
                var regex = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
                if(order.elements['email'].value.length<1)
                {
                        alert("Please enter your email address.");
                        return false;
                }
                else if(!regex.test(order.elements['email'].value))
                {
                        alert("Please enter a valid email address.");
                        return false;
                }
                return true;
        }
 }
 </script> 


---

but it doesnt check the VALIDITY of anything, it just checks for typos. -_-

Nile: i tried entering your code but it doesnt work. :(