Stdlib: pack()/unpack() enum operands — warn + backing scalar (#6213, #5713)

[PurHur]

Summary

• pack() no longer routes value operands through VmJson::export(); PackEngine coerces Variable enum cases with Zend semantics (php-src ext/standard/pack.c).
• Int-backed enum numeric formats: E_WARNING (“Object of class … could not be converted to int/float”) + backing scalar packed.
• String formats (a/A/Z/h/H): enum cases throw Error (object-to-string), matching Zend.
• unpack() enum-as-operand TypeError unchanged (Stdlib: unpack() — enum case data/format operands must TypeError not LogicException (ext/standard/pack.c, php-src-strict) #6078 compliance already green).

Closes #6213
Related: #5713

php-src reference

• ext/standard/pack.c — php_pack() argument coercion

PHP implementation

• ext/standard/pack.php, ext/standard/PackEngine.php, ext/standard/VmPack.php
• lib/VM/EnumCaseSupport.php — packCoerceToLong(), packCoerceToDouble(), packRejectStringOperand()

Verification

docker info >/dev/null
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php test/repro/issue_6213_pack_unpack_enum.php
php bin/vm.php test/repro/issue_6213_pack_unpack_enum.php
vendor/bin/phpunit --filter "pack_backed_enum|pack_enum_string|unpack_enum"
php bin/compile.php -l test/repro/aot_pack_backed_enum.php
'

Output (2026-06-10):

PHP Warning:  Object of class E could not be converted to int
array(1) { [1]=> int(1) }
---VM---
PHP Warning:  Object of class E could not be converted to int
array(1) { [1]=> int(1) }
PHPUnit OK (6 tests)
bin/compile.php -l exit 0

Note: full AOT link for pack() remains blocked by pre-existing StringPackJit LLVM verify failures on master; -l lint passes for the enum repro.

Made with Cursor