Stdlib: stream wrapper parity — readfile/scandir/debug_zval_dump (#18417, #18418, #18419)

[PurHur]

Summary

• Regression: readfile(php://output) returns 0 not -1 — Zend stdout sentinel (ext/standard/streams.c) #18417 — readfile('php://output') returns Zend stdout sentinel -1 (not 0) via VmFs::readfile() failed-output-handle path.
• Regression: scandir()/opendir() on php://filter — ENOENT not "not implemented" (ext/standard/dir.c) #18418 — scandir() / opendir() on non-directory PHP wrappers (php://filter, php://memory, …) emit Zend not implemented + scandir errno follow-up; shared VmDirOpenFailure SSOT for VM + JIT (ScandirFailureJitHelper, OpendirJitHelper).
• Stdlib: debug_zval_dump() stream resource — object(Resource) not resource() line (ext/standard/var.c) #18419 — debug_zval_dump() prints resource(id) of type (typename) refcount(n) for stream handles (shared VmVarFormat + VmDebugZval::countResourceReferences()), matching var_dump() resource shape.

php-src refs: ext/standard/streams.c, ext/standard/dir.c, ext/standard/var.c.

Test plan

• Issue repros (VM):

  ./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
  php bin/vm.php test/repro/maintainer_gap_readfile_php_output_return.php
  php bin/vm.php test/repro/maintainer_gap_scandir_filter_wrapper_error.php
  php bin/vm.php test/repro/maintainer_gap_debug_zval_dump_stream.php'

  Output:

  -1 / 0 / 0
  scandir_warnings=2 (not implemented + errno 0 Success)
  opendir_warnings=1 (not implemented)
  resource(N) of type (stream) refcount(2)
  resource(N) of type (Unknown) refcount(2)
  

• Compliance guards (VM + JIT):

  ./script/phpunit.sh --filter "readfile_php_output|scandir_filter_wrapper_error|debug_zval_dump_stream"
  # OK (6 tests, 6 assertions)

• ./script/ci-fast.sh (inventory regen, spine 4705/4705, M5 fast gate)

Closes #18417
Closes #18418
Closes #18419

Made with Cursor

[PurHur]

Superseded: #18417/#18418/#18419 merged on master via #18421/#18420/#18423. Follow-up PR incoming for data:// dir-open + scandir errno followup parity.