filter_var in php 5.3.8

Question

I am developing a user registration form and want to validate a user\'s email address. However,all the php docs I have read suggest the use of filter_var. My script validate

Answer 1

$email = isset($_POST['email']) ? $_POST['email'] : "";
echo(filter_var($email,FILTER_VALIDATE_EMAIL) ? "valid email" : "invalid email");