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Removed subsystems

The native runtime does not contain or link:

  • the runtime PHP compiler, parser/scanner, opcode execution loop, and Zend VM handlers; the executor data structures and internal-call APIs needed by AOT functions remain;
  • runtime code evaluation and source loading: eval, include, include_once, require, and require_once;
  • SAPI, automatic filesystem discovery/loading of php.ini, dynamic module loading, and runtime extension loading;
  • Zend/Optimizer and its op_array optimization passes;
  • socket transports, remote and user-defined stream wrappers, sockets, DNS, processes, shell execution, signals, or dynamic library loading; local file and glob streams remain available;
  • external PCRE2, ICU, OpenSSL, zlib, libxml, SQLite, curl, or any other third-party library;
  • platform thread or event-loop libraries.

The built-in modules retain only APIs inside the C11/C++17/POSIX capability policy (and the smaller WASI subset). For example, SPL container classes remain while its filesystem iterators are currently removed; standard file/directory/stat and hash file/stream functions remain. Other extensions are installed as Composer source packages and linked into the application at build time.

The compiler may still use a normal PHP installation. This document describes only dependencies of the generated native artifact.

The vendored tree intentionally omits the parser-generator inputs and generated token headers (zend_language_parser.y, zend_language_parser.h, zend_language_scanner.l, and zend_language_scanner.h), together with the unused zend_compile.c, zend_ast.c, and zend_highlight.c implementations. Runtime ABI headers such as zend_compile.h and zend_ast.h remain because class metadata, Reflection, and executor structures expose their types even without a parser. Nano's required non-compiler helpers are selected into src/zend_compile_runtime.c.

All upstream .phpt files are omitted. They require the PHP CLI, source compiler, and ZendVM test runner that Nano deliberately does not provide. Executable Nano coverage lives in tests/*.cpp and runs through CTest.