Add visual regression tests (#994)

Co-authored-by: Roman Pronskiy <roman@pronskiy.com>
Co-authored-by: Derick Rethans <derick@php.net>

Fix: Move server log and PID files to .build/server/ (#956)

Fix: Move cache file to .build/php-cs-fixer/ (#954)

Enhancement: Use phpunit/phpunit to run tests

Enhancement: Run end-to-end test asserting HTTP response status code (#900)

Fix: Clean up .gitignore (#899)

Enhancement: Run friendsofphp/php-cs-fixer on GitHub Actions

Co-authored-by: Markus Staab <maggus.staab@googlemail.com>

Closes GH-559.

Enhancement: Document platform requirement in composer.json

Closes GH-408.

Micro Optimizations - Round #2

* .gitignore: Remove redundant entry

* Minor optimizations with ternary operators

* Use `const` instead of `define()` where appropriate

Micro Optimizations - Round #2

* .gitignore: Remove redundant entry

* Minor optimizations with ternary operators

* Use `const` instead of `define()` where appropriate

`const` is quite faster because of the compile-time optimizations. Because the replaced statements are not declaring constant conditionally, it's safe to use `const` in all of these places.

Closes GH-608.

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Adding in php[world] Call for Speakers

Adding entries to the gitignore

Add gitignore