Fat-Free Framework: New `$ttl` attribute for <include>

index.php

<?php

$f3 = require 'base.php';

error_reporting(E_ALL);

$f3->DEBUG = 3;
$f3->UI = 'UI/';
$f3->CACHE = 'folder=tmp/cache/';
$f3->TEMP = 'tmp/temp/';

echo Template::instance()->render('test.html');

tmp cache j6wc2ffcgezd.i2a3nmr43db

a:3:{i:0;s:42:"<h2>somefile.html</h2>

<p>1448025630</p>
";i:1;d:1448025630.0445809;i:2;i:0;}

tmp temp 1j701cf1ls9vc.39jbv4pyk7k0c.php

<h1>test.html</h1>

<?php echo $this->render('somefile.html',$this->mime,get_defined_vars(),5); ?>

tmp temp 1j701cf1ls9vc.i2a3nmr43db.php

<h2>somefile.html</h2>

<p><?php echo time(); ?></p>

UI somefile.html

<h2>somefile.html</h2>

<p>{{ time() }}</p>

UI test.html

<h1>test.html</h1>

<!-- https://github.com/bcosca/fatfree-core/pull/96 -->
<include href="somefile.html" ttl="5"/>