Add support for @, magic constants in PHP web search

The php.net website REALLY needs to be "fixed" (?) / enhanced
to make it easier (or even possible) to SEARCH for non-textual items
(non-alphanumeric), or textual items that contain non-alphanumeric characters.

For example, I just spent WAY too many minutes trying to find help
on the "At Sign" (@) prefix 'Error Control Operator'.

Or good luck finding help on "++", or "FILE",
or any of the other MANY items like them.

It's pretty ridiculous, really.

This has been a problem for DECADES. (afaik)

I would have thought it would have been corrected decades ago.

— Bill D.

L'issue non indica file, test o un punto di ingresso per la ricerca. Inizia individuando l'implementazione della ricerca web di php.net e il modo in cui vengono tokenizzate o indicizzate le query contenenti @, ++ e FILE. Il lavoro è completato quando questi esempi, insieme a termini PHP simili non alfanumerici, possono essere trovati in modo affidabile.