false is not recognized as the result of exec() in PHP 7.*

[jacekkarczmarczyk]

Bug report

For PHP 7.2-7.4 phpstan returns an error when comparing the result of exec() to false. It works fine for PHP 8.*. I don't see anything in php docs saying that the return type is different for PHP 7 and 8

https://www.php.net/manual/en/function.exec.php

Code snippet that reproduces the problem

https://phpstan.org/r/3fe47f5e-f27b-4b4e-9594-5e7e0e6e8313

Expected output

No error

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[ondrejmirtes]

Please follow this issue template next time: https://github.com/phpstan/phpstan/issues/new?assignees=&labels=&projects=&template=Function_signature_mismatch.md

Please send a pull request in phpstan/phpstan-src that updates file resources/functionMap.php instead. Thank you.

[ondrejmirtes]

Fixed phpstan/phpstan-src#2974

[github-actions]

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