[PHP-WEBMASTER] [web-php] PR #1180: Reuse existing output

[Girgias]

Pull Request: https://github.com/php/web-php/pull/1180
Author: Girgias

@soyuka my JS skills are very rusty, so there might be a better and less tag 
dependent way on doing this.

But this allows reusing the existing output for examples if it exists.