HTML Php

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if (isset($_SERVER["PHP_AUTH_USER"])) {
  $user = $_SERVER["PHP_AUTH_USER"];
  $pass = $_SERVER["PHP_AUTH_PW"];
} elseif (isset($_SERVER["HTTP_AUTHORIZATION"])) {
  if (substr($_SERVER["HTTP_AUTHORIZATION"], 0, 5) == "Basic") {
    $userpass = split(":",
      base64_decode(substr($_SERVER["HTTP_AUTHORIZATION"], 6)));
    $user = $userpass[0];
    $pass = $userpass[1];  }
}
if (!isset($user) || !isset($pass) || $user!="php5" || $pass!="iscool") {
  header("WWW-Authenticate: Basic realm=\"PHP Protected Area\"");
  header("HTTP/1.0 401 Unauthorized");
} else {
  echo("Welcome, $user!");
}
?>