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`namespace` declarations appear on their own line in PHP FIG examples as well as in common PHP frameworks. While not officially part of PSR-2, we should still follow this common practice of not putting `namespace` declaration on the same line as `<?php`. - http://www.php-fig.org/psr/psr-2/ - https://github.com/laravel/laravel/blob/master/app/User.php#L1-L3 - https://github.com/symfony/filesystem/blob/master/Filesystem.php#L1-L12 - https://github.com/zendframework/zend-mail/blob/master/src/Address.php#L1-L10