Atweet PHP Framework - in less that 140 bytes

atweet.php

require(__DIR__.'/c.php'); 
if(($a=!empty($_GET['r'])?$_GET['r']:'index')&&(!is_callable($a)||substr($a,0,1)=='_'))die("Ooops...");
$a();

c.php

<?php

function index() {
   echo 'main index action';
}

function test() {
   echo 'action test';
}

function _test() {
   echo 'protected action';
}

index.php

<?php

include 'atweet.php';