ob_get_clean() can return false #14985

Bug report

Strict comparison using === between string and false will always evaluate to false.

There is no check whether ob_start() was successful, so the if condition cannot be guaranteed to be always false, as PHPStan claims.

Code snippet that reproduces the problem

https://phpstan.org/r/d8ad7f75-48ec-4256-9a5b-ce36b448294a

Expected output

If there is check that ob_start() was successful, PHPStan will not report "Strict comparison using === between string and false will always evaluate to false."

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