Adjust some rules of the PSR-2

[bjverde]

Rules for this Issue

• [ ] All PHP files MUST use the Unix LF (linefeed) line ending.
• [ ] All PHP files MUST end with a single blank line.
• [ ] The closing ?> tag MUST be omitted from files containing only PHP.

source: https://www.php-fig.org/psr/psr-2/