(PHP) Help for authentication

Question

How do I add more values that can authenticate to echo "ACCESS"

Aka add more variables aside from "a" so I can type http://url/file.php?auth=a OR auth=b OR auth=c , etc.

My code:

<?php

$auth = ("a");

if(@$_REQUEST["auth"]!="$auth"){
  echo ("ACCESS DENIED");
}

else {
  echo "ACCESS";
}

?>

Answer 1

I think you want in_array :

$auth = array('a', 'b', 'c');
if (!in_array(@$_REQUEST["auth"], $auth)) {
    echo ("ACCESS DENIED");
}
else {
    echo "ACCESS";
}