Fix PHP 8.5 compatibility: mysqli conversion, utf8_decode removal, collation fixes, null-safety, unquoted array keys, -> fix, conversion_ts_mysql NULL guard

www/tyroltenn/AGENTS.md

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+# resatennis_tyroltenn - AGENTS.md
+
+## Repo structure
+
+Legacy PHP app for tennis court reservation, club management, and championship tracking. No framework, no build system, no test harness.
+
+- `/tyroltenn/` — application root. Hundreds of standalone `.php` files, no MVC separation.
+- `/tyroltenn/conf.php` — **DB credentials & connection**. Never commit this file.
+- `/tyroltenn/constantes.php` — time slots, rating tiers, holiday list, reservation limits, color constants.
+- `/tyroltenn/fpdf.php`, `/tyroltenn/jpgraph/`, `/tyroltenn/font/` — bundled libraries (no composer).
+- `/tyroltenn/images/` — assets. `/tyroltenn/videos/` — FLV videos + player SWF.
+
+## Entry points
+
+| Entry | Purpose |
+|---|---|
+| `index.php` | Landing — links to 4 sub-apps |
+| `login_resa.php` | Court reservation portal |
+| `login_champ.php` | Championship (club captain) portal |
+| `admin_login.php` | Club admin panel |
+| `serveur_vocal.php` | IVR telephone reservation server |
+| `connexion_port.php` / `consult_port.php` / `inscription_port.php` | Mobile/wap portal |
+
+Every page starts with `include("enTete.php")`, `include("menu.php")`, `include("piedDePage.php")`.
+
+## DB
+
+MySQL/MariaDB on `10.10.10.22:3307` with failover to `10.10.10.50:3306`. `mysqli` (procedural). Connection happens in `conf.php`.
+
+## Files to exclude / preserve
+
+```
+*.bak  *.BAK  *.old  *.new  *.sav
+planning_resa_suite.php.old
+login_resa_suite.php.old
+login_resa_suite.php.new
+fct_affichage_planning.php.BAK
+fct_affichage_planning.php.old
+liste_jetons.php.old
+```
+
+`.gitignore` should be present. **Never commit `conf.php`** — it holds plaintext DB passwords and SMS credentials.
+
+## Gotchas
+
+- **No `conf.php` in git** — each environment generates its own copy at deploy time.
+- PHP short tags `<?` are used alongside `<?php` — edit carefully.
+- All `mysqli` calls are procedural, not OOP.
+- The old `www/conf.php` (parent directory) has different credentials — it belongs to the legacy `www/` site, not the tyroltenn app. Only `tyroltenn/conf.php` matters for this app.
+- Files ending in `_suite.php` are form-action handlers (POST processing). Pair them with their `_` counterpart.
+- `fct_jatennis.php` / `fct_jatennis_v2.php` — integration with external "JTennis" service.
+- `fpdf.php` is included inline for PDF planning exports. Do not refactor it separately.
+- No routing layer — filenames map directly to URLs. Renaming a file without a redirect will break hotlinks/TV screens.
+
+## No build/lint/test
+
+There is no lint, typecheck, test, or build command. Changes are deployed by rsync/scp to the web server. Manual browser testing is the only verification.