Thread: Email validation

Hi all, I'm trying to add email validation to a form but don't exactly know where to put it. I would like to add the code found HERE but don't know where it should go on the page. What I have right now is

Code:

<?
$errors=0;
$error="The following errors occured while processing your form input.<ul>";
$_POST['firstname']=preg_replace("/(\015\012)|(\015)|(\012)/","&nbsp;<br />", $_POST['firstname']);if($_POST['firstname']=="" || $_POST['lastname']=="" || $_POST['email']=="" || $_POST['comments']=="" ){
$errors=1;
$error.="<li>You did not enter one or more of the required fields. Please go back and try again.";
}
if($errors==1) $msg.="You did not enter one or more of the required fields.<br />Please go back and re-enter your contact request.";
else{
$where_form_is="http".($HTTP_SERVER_VARS["HTTPS"]=="on"?"s":"")."://".$_SERVER['HTTP_HOST'].strrev(strstr(strrev($_SERVER['PHP_SELF']),"/"));
$message="
Firstname: ".$_POST['firstname']."
Lastname: ".$_POST['lastname']."
Email: ".$_POST['email']."
Address: ".$_POST['address']."
City: ".$_POST['city']."
State: ".$_POST['state']."
Zip: ".$_POST['zip']."
Phone: ".$_POST['phone']."
Interested: ".$_POST['interested']." 
Comments: ".$_POST['comments']."
";
mail("someone@somewhere.com","Stuff",$message,"From: Web Form");f
mail("$email","Thank you for contacting us", "Hi $firstname,\n
Thank you for contacting us!\n
We will respond to your enquiry as soon as possible.\n\n\n
Thanks.; 
$msg.="Thank you!<br />Your enquiry has been submitted and we will respond as soon as we can.";
}
?>

Thanks.

You could add a function to check basically the syntax of the entered email address.

By the way, if you or your host plans to upgrade to php5, you better change all instances of the loose php tag "<?" to the proper php tag "<?php" or your page will die when php5 is running.

In your code, add the red lines:

Code:

<?
$errors=0;
$error="The following errors occured while processing your form input.<ul>";
$_POST['firstname']=preg_replace("/(\015\012)|(\015)|(\012)/","&nbsp;<br />", $_POST['firstname']);if($_POST['firstname']=="" || $_POST['lastname']=="" || $_POST['email']=="" || $_POST['comments']=="" ){
  $errors=1;
  $error.="<li>You did not enter one or more of the required fields. Please go back and try again.";
}
if (!is_valid_email($_POST['email'])) {
  $errors=1;
  $error.="<li>Your email address does not appear to be valid. Please go back and try again.";
}

Now, you can just add this before the end of the php: (the line before the "?>")

Code:

function is_valid_email($email) { 
  if(ereg("([[:alnum:]\.\-]+)(\@[[:alnum:]\.\-]+\.+)", $email))
    return 0;
  else 
    return 1;
}

Thanks so much for the help, and I appreciate the heads-up with regards to the php tag, that would have been very problematic.