Echos one of two alternatives depending on a condition
ecco(1 == 2, 'hell freezes over', 'everything is ok');
// will most definitely echo 'everything is ok'
<ul>
<?php foreach($pages as $p): ?>
<li<?php ecco($p->isActive(), ' class="active"') ?>>
…
</li>
<?php endforeach ?>
</ul>