Why is the text not immediately displayed in the console?

Question

PHP

I wrote a script in php and run it in the terminal, it contains the text that is displayed before connecting

include_once($_SERVER['DOCUMENT_ROOT'] . '/bitrix/modules/main/include/prolog_before.php');

output immediately, everything that follows, until the script completes its work. What is the reason? How to make it so that it outputs immediately, and not after execution?

Answer 1

The following helped:

while (ob_get_level()){
    ob_end_flush();
}