Simple request

hello.php

<?php

$req = parse_url($_SERVER['REQUEST_URI']);

// querystring
isset($req['query']) ? parse_str($req['query'], $req['query_arr']) : $req['query_arr'] = array();

// route
$req['route'] = substr($_SERVER['PHP_SELF'], strlen($_SERVER['SCRIPT_NAME']));

switch ($req['route']) {
	case '/aa':
		echo 'Hello ' . escape(trim($req['route'], '/'));
		break;
	
	default:
		echo 'error';
		break;
}

var_dump($req);


// =========================================================

function escape($text, $flags = ENT_COMPAT, $charset = null, $doubleEncode = true)
{
    return htmlspecialchars($text, $flags, $charset ? $charset : 'utf-8', $doubleEncode);
}