WCAF- is not compatible with php 7.3
shows 18 errors with PHP Compatibility Checker plugin
We’re marking this particular request closed as the warnings reported by PHP Compatibility Checker are actually false positives, as detailed in the comments.
AdminNick (WP Engineer, Never Settle) commented
While it's true that the PHP Compatibility Checker plugin shows errors/warnings for the plugin, the plugin is actually already compatible with PHP 7.3 and above. The warnings reported fall into three categories:
1. Errors triggered by the external Kint debugging library ("object is a soft reserved keyword") included with the plugin, which the author of that library has indicated is an overzealous characterization by the compatibility checker and doesn't actually cause PHP errors as used in Kint: https://github.com/kint-php/kint/issues/332
2. Warnings about iconv_set_encoding, which is only for backwards compatibility and never runs on newer PHP versions because it's inside a conditional.
3. Warnings triggered by the external Amazon MWS library "about a double underscore prefix" - these are only warnings and because it's an external library we're avoiding making additional changes to it.
So, it's fine to run the plugin on PHP 7.3, and the plugin code itself, aside from external dependencies is free of any warnings or errors. Thanks and hope that helps.