$clean = array();$email_pattern = '/^[^@\s<&>]+@([-a-z0-9]+\.)+[a-z]{2,}$/i';if (preg_match($email_pattern, $_POST['email'])) { $clean['email'] = $_POST['email']; }The example code above (Source) uses an array called $clean to store the filtered value from $_POST. It's considered a security good practice. What are the advantages of using such an approach?
Declaring Clean Data
php