PHP capture print/require output in variable

01index.php

<?php

function renderHtml($name) {
    $path =    $name;

    if (file_exists($path) == false) {
        throw new Exception('View not found in '. $path);
        return false;
    }

    ob_start();
    require($path);
    $output = ob_get_clean();

    return $output;
}


file_put_contents("template.html", renderHtml("body.php"));
echo renderHtml("body.php");

02body.php

<?php

$content = '<div id="top"></div>';
$content.= renderHtml('title.php');

print($content);

03title.php

<?php

$content = '<h1>Page heading</h1>';

print($content);