[SOLVED] CB Code field does not execute PHP code

Hello,
my environment Apache 2.4, PHP 7, Joomla 3.6 and all latest CB Add-Ons.
I tried to create a Tab for user where PHP script will be placed.

I've create a tab PHP and create field CODE using CB Code plugin.
As krileon said "It only executes PHP so anything you can do from PHP you can do from a Code field. Please keep in mind it executes your string as an anonymous function so you don't need php tags."
OK, under Parameters of CB Code field I placed a simplest PHP code

print "Hello World!";

But nothing appear on frontend under user "PHP" Tab. CB Code plugin is published.
Please, advise any idea why it happens and how to execute a PHP code.

It adds your PHP as an anonymous function then executes it while being surrounded by ob functions. Your print output isn't going to do anything because it's self contained using the ob functions. It outputs the return value of the anonymous function so if you want anything to output you need to do a return. Example as follows.

Code
See the below to understand how anonymous functions and ob functions work.

php.net/manual/en/functions.anonymous.php
php.net/manual/en/function.ob-start.php
php.net/manual/en/function.ob-end-clean.php

CB Code Field does have output templates though so you could always make a template file that handles the code however you want.

OK, thank you for the hints.
Will try to sort it out.