[DomCrawler] [DomCrawler] Fixed incorrect value name conversion in getPhpValues() and getPhpFiles()

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #6908
| License       | MIT

This PR replaces #10193