No... won't work.... with like php81-php

@nikic seems better.... but probably some cases are still not handled... at least the common ones are ok

e.g.

• no prefix / suffix
• "zts-" prefix
• "php81-" prefix with php
• "81" suffix

(such cases, like "myphp" suffix, still broken... )

I liked the previous version more. Supporting php81-php imho doesn't make sense, as we can't make a sensible guess if the string contains php more than once. Correct spelling is php-8.1 or php8.1.

1st way merged as ea00e65