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Intentional divergences from PHP

  • zend_long is always signed 64-bit, including wasm32, to preserve TypePHP's integer semantics across targets.
  • zend_call_function is implemented by the PHPX TypePHP Nano helper. It dispatches registered internal/AOT handlers only; it does not execute opcodes or evaluate/load PHP source.
  • Runtime AST conversion to partial/first-class callables is rejected because upstream implements it by compiling a new op-array (and optionally caching it in Opcache).
  • Zend MM retains its upstream allocation algorithms, but its platform page allocator is replaced by the POSIX posix_memalign()/free() boundary. Huge-page advice and in-place mapping growth/truncation are unavailable.
  • Zend bailout uses C11 setjmp()/longjmp() instead of POSIX sigsetjmp()/siglongjmp().
  • Execution timers and signal handling are not compiled for Nano targets.
  • PHP wall-clock, monotonic-clock, and sleep functions use the C++17 <chrono> and <thread> APIs. PHP's date parsing, calendar arithmetic, timezone database, and DateTime classes continue to use the vendored PHP 8.6 timelib sources.
  • Zend allocation uses the C11 allocation API for Nano targets; OS virtual memory mapping and page-advice paths are not compiled.
  • WASI builds do not link the SDK's mmap or signal emulation libraries.
  • Non-standard libc case-insensitive string helpers are implemented by the Nano C11 portability unit.
  • Arrays, strings, objects, cyclic collection, and interned strings use their selected PHP 8.6 Zend implementation units.
  • ext/standard/html.c omits the SAPI/default-charset lookup in Nano. The original UTF-8 decoder remains compiled for JSON, while Nano has no SAPI or SAPI-provided default charset state.
  • PHP output buffering is retained, but its final writer is the native/WASI console writer; SAPI headers and URL output rewriting are absent.
  • Standard functions and arginfo are generated from PHP 8.6's guarded basic_functions.stub.php. Nano retains local filesystem access, but does not expose or configure PHP's open_basedir policy.
  • Runtime constant AST values and complex arginfo defaults that require the PHP parser are rejected. Generated Nano arginfo uses literals handled without AST parsing.