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During an HTTP authentication, how does one determine the username and password provided by the browser?

  1. Parse the HTTP headers manually using http_get_headers()
  2. Use the get_http_username() and get_http_password() functions
  3. Use the $_SERVER['HTTP_USER'] and $_SERVER['HTTP_PASSWORD'] variables
  4. Use the $_SERVER['PHP_AUTH_USER'] and $_SERVER['PHP_AUTH_PW'] variables
  5. Parse the $_SERVER['REQUEST_URI'] variable

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