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Subject: Re: [PHP-DEV] BC breaking changes in PHP 8.1
From: sebastian@php.net (Sebastian Bergmann)

Am 23.09.2021 um 18:52 schrieb Nikita Popov:
> I believe that this continues to be the default behavior of PHPUnit for
> example. This means that in practice, deprecations do break code, even
> though they are intended not to.

That is correct: by default, PHPUnit converts PHP deprecations, errors, 
notices, and warnings to exceptions.

While disabling the conversion of PHP deprecations to exceptions, for 
instance, is possible by setting convertDeprecationsToExceptions="false" 
in your PHPUnit XML configuration file, I do think that the default should 
be changed to not covert PHP deprecations to exceptions.

The next releases of PHPUnit 8.5 and PHPUnit 9.5 will change this.