pass password protection php

index.php

<?php
function require_auth() {
	$AUTH_USER = 'admin';
	$AUTH_PASS = 'password';
	header('Cache-Control: no-cache, must-revalidate, max-age=0');
	$has_supplied_credentials = !(empty($_SERVER['PHP_AUTH_USER']) && empty($_SERVER['PHP_AUTH_PW']));
	$is_not_authenticated = (
		!$has_supplied_credentials ||
		$_SERVER['PHP_AUTH_USER'] != $AUTH_USER ||
		$_SERVER['PHP_AUTH_PW']   != $AUTH_PASS
	);
	if ($is_not_authenticated) {
		header('HTTP/1.1 401 Authorization Required');
		header('WWW-Authenticate: Basic realm="Access denied"');
		exit;
	}
}

minified version

function require_auth($u,$p){$AUTH_USER=$u;$AUTH_PASS=$p;header('Cache-Control: no-cache, must-revalidate, max-age=0');$has_supplied_credentials=!(empty($_SERVER['PHP_AUTH_USER'])&&empty($_SERVER['PHP_AUTH_PW']));$is_not_authenticated=(!$has_supplied_credentials||$_SERVER['PHP_AUTH_USER']!=$AUTH_USER||$_SERVER['PHP_AUTH_PW']!=$AUTH_PASS);if($is_not_authenticated){header('HTTP/1.1 401 Authorization Required');header('WWW-Authenticate: Basic realm="Access denied"');exit;}}

require_auth('admin','password');