Revive: PHP 8.5 compatibility, Docker support, CI

[miglen]

Summary

Brings PHProxy back to life on modern PHP (8.5) and ships a first-class Docker install option. Built on top of the open PHP-8 PRs from the community.

What changed

PHP 8.5 compatibility

• get_magic_quotes_gpc() removed → set stripslashes flag to false
• Curly-brace string offsets ($_iflags{$i}, $dir{$i}) → []
• each($_auth_creds) removed → array_key_first()-based lookup
• $_COOKIE['userAgent'] access guarded with isset()
• trim() inputs cast to (string) for HTTP_REFERER, response headers, cookie-domain parsing
• ?string nullable params (PHP 8.4 deprecation, 8.5 error-on-deprecate)
• intdiv() in the Punycode loop in idna.class.php (eliminates two float-to-int deprecations)
• E_STRICT dropped from the develop-mode error-reporting line (removed in 8.4)

Modernization (incorporates #47)

• Type hints across files/php/functions.inc.php
• Short [] array syntax throughout

Docker (new)

• Dockerfile based on php:8.5-apache, mod_rewrite enabled
• docker-compose.yml with dev bind-mount + a comment on running prod-mode
• .dockerignore

docker compose up -d
# open http://localhost:8080

CI (new)

• .github/workflows/lint.yml — php -l on every *.php, matrix on php:8.1-cli and php:8.5-cli

README

• Docker quickstart section above standalone install
• PHP requirement bumped to >= 8.1, tested on 8.5
• Modern-site limitation documented (CF/JS-gated sites won't work — fundamental design limitation of a regex-rewrite proxy)

Credits

• #47 by @Quix0r — applied as the base; fixed the each() replacement (had a typo + wrong count guard) and added ?string nullable params 8.4/8.5 require
• #29 by @dacendo — null-trim casts that Fixes towards PHP8 and type-hinting #47 missed

Closing PRs and the PHP-8 issue bucket (#25, #32, #38, #43, #46) after merge. #41, #42, #31 will be closed with a note pointing at the documented modern-site limitation.

Test plan

Verified inside the shipped php:8.5-apache container (PHP 8.5.6):

• php -l clean on every *.php file
• Entry form renders cleanly
• Settings page (edit.php) renders cleanly
• HTTP proxy fetch of http://example.com/ — page returned, links in body rewritten through the proxy
• HTTPS proxy fetch of https://example.com/ — same
• Direct IDNA encode test: münchen.de → xn--mnchen-3ya.de, 例え.テスト → xn--r8jz45g.xn--zckzah (correct Punycode)
• POST entry-form submission redirects correctly
• Zero deprecation/warning/notice output anywhere with error_reporting(E_ALL) and display_errors=1

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