From the PHP manual[1]:
> The closing tag of a PHP block at the end of a file is optional, and in some
> cases omitting it is helpful when using include or require, so unwanted
> whitespace will not occur at the end of files, and you will still be able to
> add headers to the response later. It is also handy if you use output
> buffering, and would not like to see added unwanted whitespace at the end of
> the parts generated by the included files.
1: https://www.php.net/manual/en/language.basic-syntax.instruction-separation.php#example-41
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