<?php
ob_start();
function level(){
function level2(){
echo 'Text that won\'t get displayed.';
}
}
level(level2);
echo "\n";
var_dump(ob_get_level());
?>
Fatal error: Uncaught Error: Undefined constant "level2" in /in/aVIjD:8
Stack trace:
#0 {main}
thrown in /in/aVIjD on line 8
Process exited with code 255.