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Stdlib: unpack() named format:/string: — compile error vs Zend array (ext/standard/pack.c) #11577
Description
Category
stdlib · php-src-strict · refs #1492
Problem
unpack() with named parameters format: and string: must compile and return the unpacked array. Zend: unpack_named_ok=1. VM: compile-time failure:
Cannot use positional argument after named argument
Positional unpack('n', $data) works.
Verified 2026-06-25 — test/repro/maintainer_gap_unpack_named_format_string.php.
php-src reference
- php/php-src
ext/standard/pack.c—php_unpack
Repro
test/repro/maintainer_gap_unpack_named_format_string.php
php test/repro/maintainer_gap_unpack_named_format_string.php
php bin/vm.php test/repro/maintainer_gap_unpack_named_format_string.phpImplementation hints (PHP-in-PHP)
- Fix named-arg lowering for two-parameter builtins (
format,stringper stub) ext/standard/VmPack.php/ shared JIT — not new C format tables- Regression: pack() nested call operand — empty string / null not packed bytes (ext/standard/pack.c, re-#11313) #11365 nested pack operand is separate runtime parity
Done when
- Repro:
unpack_named_ok=1on VM/JIT/AOT - Named
offset:(when added) follows same binder path
Related
- Regression: pack() nested call operand — empty string / null not packed bytes (ext/standard/pack.c, re-#11313) #11365 pack nested operand · Stdlib: pack() — invalid format string warning + false return parity (ext/standard/pack.c) #4532 pack invalid format · Epic: Self-host critical path — compiler compiles itself (M3→M5) #1492
Activity
PurHur commentedon Jun 25, 2026
claim: PHP Compiler STD Lib — batch (issues #11578, #11577, #11576)
Register format/string/offset named parameters for unpack() (#11577) (#…
PurHur commentedon Jun 25, 2026
Merged via #11584. VM + AOT repro green:
unpack_named_ok=1.PurHur commentedon Jun 25, 2026
Reopening: #11584 merged but
maintainer_gap_unpack_named_format_string.phpstill compile-fails on master (2026-06-25). Track remaining work in #11590.PurHur commentedon Jun 25, 2026
Cleanup bot note: not a duplicate of closed #11590 — this is a regression re-file after #11584 merged (2026-06-25). Keeping
test/repro/maintainer_gap_unpack_named_format_string.phpuntil this issue closes. Compliance guard:test/compliance/cases/stdlib/unpack_named_format_string.phpt(verify still green on master before claiming).chore: drop stale maintainer_gap repros for closed parity issues (jun…
PurHur commentedon Jul 1, 2026
claim: PHP Runtime → PHP — batch (issues #14545, #11577)
PurHur commentedon Jul 1, 2026
Repro green on master (2026-07-01): VM + JIT both print unpack_named_ok=1 for test/repro/maintainer_gap_unpack_named_format_string.php — unclaiming from batch.
PurHur commentedon Jul 11, 2026
Verified green on master (2026-07-11, worker lane A). VM repro matches Zend; compliance/tests already present. Closing stale open issue.