Workaround bug in slevomat/coding-standard TypeNameMatchesFileName #3711
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For each root namespace, the slevomat rule considers the left-most match of the given directory in the absolute path of the file. That is, for /home/user/src/phpstan-src/ the root namespace PHPStan is not assigned to /home/user/src/phpstan-src/src, but to /home/user/src, which is obviously wrong.
The bug is known as slevomat/coding-standard#1249 for a long time, but yet to be fixed. To avoid issues for developers of PHPStan, we can set a basepath of "." in the PHP CodeSniffer config, which causes paths to be evaluated relative to the current directory, avoiding false-positives in the path leading up to the phpstan-src directory.