Exploring ways to handle block component includes in just php (without a template system), not quite sure using the anonymous function is the best approach but removed need to have separate function to end the block although could do this with a class I just didn't like having to instantiate it on each block. Ideas?

gistfile1.php

<?
    
	$content = 'content before';

	function block($tpl){
		ob_start();

		return function() use ($tpl){
			$content = ob_get_clean();
			include('templates/' . $tpl . '.php');	
		};
	}

?>

	<style>
		div {border: 1px solid red; margin: 5px; padding: 5px;}
	</style>

	<? $btn = block('button') ?>
		This is my rifle. There are many like it, but this one is mine.

		<? $btn = block('button') ?>
			My rifle is my best friend. It is my life. I must master it as I must master my life.

			<? $btn = block('button') ?>
				My rifle, without me, is useless. Without my rifle, I am useless. I must fire my rifle true. I must shoot straighter than my enemy who is trying to kill me. I must shoot him before he shoots me. I will...
			<? $btn() ?>

		<? $btn() ?>

	<? $btn() ?>