Listing 3. Splitting the Local Part and Domain

$isValid = true;
$atIndex = strrpos($email, "@");
if (is_bool($atIndex) && !$atIndex)
{
   $isValid = false;
}
else
{
   $domain = substr($email, $atIndex+1);
   $local = substr($email, 0, $atIndex);
   // ... work with domain and local parts
}