Try this
$allowedUsers = array("azira", "admin", "fazli");
if ( strstr($description, "Domain") && strstr($description, ".my") && !in_array($newuid, $allowedUsers) {
This way you will be able to add or subtract allowed users only adding to or subtracting elements from the array.
Sorry, but can you say what was the problem and how you have solved it?
Bye