write the inspect variables guide page

[carlos-granados]

Replaces the inspect variables placeholder with the full guide page, IDE-agnostic throughout.

Covers stack levels and selecting an outer frame, what the variables panel shows and why arrays and objects arrive collapsed, and the three variable groups.

Verified against handler_dbgp.c:

• the three contexts are exactly Locals, Superglobals and User defined constants
• level 0 is the frame where execution stopped, counting outwards to the entry point
• the constants context only includes PHP_USER_CONSTANT, so PHP's own constants and those from extensions never appear — which is part of why the group is so often empty
• max_children, max_data and max_depth are negotiated per session via feature_set, so the editor's values override the ini defaults. The page sends people to their editor's settings rather than to php.ini.

[github-actions]

PR Preview Action v1.8.1
Preview removed because the pull request was closed.
2026-09-05 13:39 UTC