Fix two more php-finding regexes

Fix two more php-finding regexes

Before: Civi code living under a path containing the characters php
(such as ~/src/php/civicrm) will fail to load the API4 explorer with
a message like the following:
    ReflectionException: "Class \Civi\Api4\src does not exist"

After: API4 explorer loads no matter what the enclosing path

Very similar to PR #16377