PHP - To echo or not to echo?

Question

What is more efficient and/or what is better practice, to echo the HTML or have many open and close php tags?

Obviously for big areas of HTML it is sensible

Answer 1

I've made myself the same question long time ago and came up with the same answer, it's not a considerable difference. I deduct this answer with this test:

test  :)$function) {
            $start = microtime(true);
            for ($i=0;$i<$amount;$i++) {
                $function($idx);
            }
            $time = microtime(true) - $start;
            $result[$idx.'_'.$function] = $time;
        }
        ob_end_clean();
        return($result);
    }
?>