theme.php
<!DOCTYPE html>
<html>
<head>
<?=$lia->getHeadHtml();?>
</head>
<body>
<header>
</header>
<main>
<?=$lia->view('error/header');?>
<?=$content?>
</main>
<footer>
</footer>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<?=$lia->getHeadHtml();?>
</head>
<body>
<header>
</header>
<main>
<?=$lia->view('error/header');?>
<?=$content?>
</main>
<footer>
</footer>
</body>
</html>