How to escape (Template Engine)?

Question

PHP

I'm starting to disassemble the template engine in order to write my own one for my needs ...
I ran into the problem of escaping <?php and ?> ..
base.html - template, contains( "{% echo 'lol'; %}").
I do this:
$temp = file_get_contents(...base.html);
echo str_replace(array('{%','%}'),array('<?php','?>'),$temp);
as a result I get a commit line:

Answer 1

here if it’s very rude .... you need to find what is inside {% %} to execute using eval and insert the result in place of {% %} . And I'm not sure that it will work with echo

Answer 2

why the heck template engine also your bike? php is a great templating engine! twig, haml, slim at the very worst