Let's take a look at the code. First we check to see if the form was submitted:

<?

//is form submitted

if(isset($_POST['key'])){

Then we collect the form data and store it in shorter variables:

//collect the information

$from=$email;

$cc=$_POST['cc'];

$bcc=$_POST['bcc'];

The next step is to filter the data and set the error message for each of the required fields:

if(empty($_POST['tos'])){

$error=true;

}else{

$to=$_POST['tos'];

}

if(empty($_POST['sub'])){

$error=true;

}else{

$subject=$_POST['sub'];

}

if(empty($_POST['msg'])){

$error=true;

}else{

$msg=$_POST['msg'];

}

Finally we test to see if the user wants to send an attachment. The attachment is sent through the $_FILES[''] array. If the file is loaded, we set the headers for the mail function. Notice that the content-disposition and content-transfer-encoding has also been set:

//check if the an attachment is present

if(isset($_FILES['userfile']['name'])){

$attachment = $_FILES['userfile']['tmp_name'], $_FILES['userfile']['name'];

$headers ="Content-disposition: attachment;

$filename=.$attachment."n";

$headers=.Content-Transfer-Encoding: base64n";

}

If there are no errors, the code continues to send the email message with or without the headers:

if(!$error){

if($headers <> ""){

$res=mail($to,$subject,$msg,$headers);

}else{

$res=mail($to,$subject,$msg);

}

}

Finally, an error check is made to inform the user if any errors occurred.

if(!$res){

echo "Mail error occurred";

}

}

?>