More of a general understanding question then a problem to solve question.
In Drupal core version 10.X.X, is there a PHP file in which a user can freely run global PHP commands that would effect any webpage in the website?
An example command is:
<?php echo 'This ' . 'string ' . 'was ' . 'made ' . 'with concatenation.' . "\n"; ?>
I ask about a file where the very last PHP in the queue would be executed, similar to how the very last JS or CSS in the queue would be globally executed at say
A "Test any PHP globally here, in the last line of the file" kind of file.
How to run global PHP?