* Avoid PHP 7.2 warnings in DBConRefTest about count() on non-Countable
* Suppress "Headers already sent" in PHP 7.2 too
* (T206476) Output only to stderr in unit tests
* Avoid PHP 7.2 warnings in DBConRefTest about count() on non-Countable
* Suppress "Headers already sent" in PHP 7.2 too
* (T206476) Output only to stderr in unit tests