function check_email_address($email) {
  // First, we check that there's one @ symbol, and that the lengths are right
  if (!ereg("^[^@]{1,64}@[^@]{1,255}$", $email)) {
    // Email invalid because wrong number of characters in one section, or wrong number of @ symbols.
    return false;
  }
  // Split it into sections to make life easier
  $email_array = explode("@", $email);
  $local_array = explode(".", $email_array[0]);
  for ($i = 0; $i < sizeof($local_array); $i++) {
     if (!ereg("^(([A-Za-z0-9!#$%&'*+/=?^_`{|}~-][A-Za-z0-9!#$%&'*+/=?^_`{|}~\.-]{0,63})|(\"[^(\\|\")]{0,62}\"))$", $local_array[$i])) {
      return false;
    }
  }
  if (!ereg("^\[?[0-9\.]+\]?$", $email_array[1])) { // Check if domain is IP. If not, it should be valid domain name
    $domain_array = explode(".", $email_array[1]);
    if (sizeof($domain_array) < 2) {
        return false; // Not enough parts to domain
    }
    for ($i = 0; $i < sizeof($domain_array); $i++) {
      if (!ereg("^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|([A-Za-z0-9]+))$", $domain_array[$i])) {
        return false;
      }
    }
  }
  return true;
}


function check_form()
{
global $HTTP_POST_VARS, $error, $print_again;
$error['name'] = false;
    if($_POST["name"]=="") {
        $error['name'] = true;
         $print_again = true;
        $message="The name field is empty<br>";
    }
    if(!check_email_address($_POST['email'])) {
        $error['email'] = true;
         $print_again = true;
        $message.="Either Field Empty or Invalid Email ID <br>";
    }
     if($print_again) {
         show_form();
       
       } else {
        show_form();
           $message="All Fields are valid <br>
        Now, In this way you can validate the other textfield as well<br>
        You can insert data into table";
       }
   echo "$message";
}
