[Debug] workaround BC break in PHP 7.3 #32090
Merged
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A new warning has been added in PHP 7.3 that is breaking BC with Symfony, since we turn warnings into exceptions.
This PR turns the new warning into a deprecation, so that we will be able to remove the added "if" in 5.0.
I noticed a few other similar BC breaks in 7.1 and 7.2, but unless someone reports that they block them, I don't think we need to care.
See https://github.com/php/php-src/blob/PHP-7.1/UPGRADING + same in upper branches.