Stdlib: scandir()/opendir() php://filter — not implemented wrapper diagnostics (#18418)

[PurHur]

Summary

• Route scandir()/opendir() directory-open failures on php:// URIs through VmFsPhpWrapper::openDirFailureReason() so VM emits Zend's not implemented text instead of generic No such file or directory.
• scandir() on php wrappers now also emits the follow-up scandir(): (errno 0): Success warning per php-src ext/standard/dir.c.
• JIT/AOT warnings moved from inline LLVM in JitFsGlob to FsGlobJitHelper/OpendirJitHelper PHP helpers (php-in-PHP SSOT).

php-src reference

• ext/standard/dir.c — php_scandir, php_opendir
• main/streams/userspace.c — wrapper dir_opener not-implemented path

PHP implementation

• ext/standard/VmFsPhpWrapper.php — openDirFailureReason()
• ext/standard/VmFilestatFailure.php — VM warnings
• ext/standard/OpendirJitHelper.php, ext/standard/FsGlobJitHelper.php — JIT/AOT warnings

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php test/repro/maintainer_gap_scandir_filter_wrapper_error.php
vendor/bin/phpunit --filter scandir_filter_wrapper_error
'

Output:

scandir=false
opendir=false
warnings=scandir(php://filter/read=string.rot13/resource=data://text/plain,test): Failed to open directory: not implemented|scandir(): (errno 0): Success|opendir(php://filter/read=string.rot13/resource=data://text/plain,test): Failed to open directory: not implemented
OK (2 tests, 2 assertions)

Closes #18418

Made with Cursor