ext-php-rs-bindings

- Use `ext-php-rs` for PHP 8.2+ native extensions. Use `#[php_class]` and `#[php_function]` macros. - Map Rust types to PHP via `FromZval`/`IntoZval` traits. Return `PhpResult<T>` for fallible operations. - Map Rust errors to PHP exceptions: `PhpException::from(...)` with specific classes (`InvalidArgumentException`, `RuntimeException`). - Use `#[php_method]` for class methods. Implement `__construct` for PHP constructors. - Build with `cargo build --release`. Load extension via `php.ini` (`extension=your_ext.so`) or PECL distribution. - Test from PHP using PHPUnit. Verify extension loading with `php -m | grep extension_name`. - Use `ZendClassObject<T>` for wrapping Rust structs as PHP objects. - PHP uses reference counting — avoid circular references in wrapped Rust structs. Implement `Drop` for cleanup. - PHP is single-threaded per request — offload CPU-intensive work to Rust, return results synchronously. - Keep PHP extension thin — business logic in Rust, PHP provides typed interface. - Anti-patterns: panics in PHP functions, blocking operations without timeout, raw pointer manipulation.