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Stdlib: sprintf()/printf()/vsprintf() — enum case operands must Error not coerce (ext/standard/sprintf.c) #8777
Description
Category
stdlib
Problem
Formatted-output builtins must reject enum case operands the same way Zend does. With %s, php-src throws Error (Object of class E could not be converted to string). VM silently coerces backed enum cases to backing strings and formats them.
php-src reference
- php/php-src
ext/standard/sprintf.c—php_sprintf,php_printf, object-to-string conversion during format processing
Repro
test/repro/maintainer_sprintf_enum_operand.php:
php test/repro/maintainer_sprintf_enum_operand.php
./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/maintainer_sprintf_enum_operand.php'| Call | Zend | VM today |
|---|---|---|
sprintf('%s', ES::X) |
Error |
NO_ERROR → 'hi' |
vsprintf('%s', [ES::X]) |
Error |
NO_ERROR |
printf('%s', ES::X) |
Error |
NO_ERROR |
Scope
ext/standard/sprintf.php,printf.php,vsprintf.php,vfprintf.php- PHP lowering in
lib/JIT/Builtin/— no new C runtime branches - JIT/AOT must match VM
Done when
- All three repro lines throw
Erroron VM (and JIT/AOT when in scope) -
./script/ci-fast.sh --filter SprintfEnumor targeted compliance PHPT green - php-src-strict
Links
- Stdlib: sprintf()/printf() positional arguments — %1$s reordering (ext/standard/sprintf.c parity) #3631 (positional sprintf — separate)
- Enum coerce class: Regression: lcfirst/ucwords/wordwrap/strtr/str_ireplace — enum case operands coerce (re-#6003, #5889, string.c) #8742, Stdlib: strpos()/explode() — enum case operands must TypeError not Error (ext/standard/string.c) #5951
Activity
PurHur commentedon Jun 16, 2026
claim: PHP Compiler STD Lib — starting this run
PurHur commentedon Jun 16, 2026
Unclaiming: sprintf/printf/vsprintf enum %s operands already throw Error on master (VmSprintf::argToString + compliance test sprintf_enum_case.phpt green). VM repro matches Zend for ES::X %s. Recommend closing as duplicate unless repro differs.
PurHur commentedon Jul 18, 2026
Already fixed — closing (lane C audit 2026-07-18)
Verified on current
master— Zend PHP andphp bin/vm.phpboth throwError: Object of class ES could not be converted to stringforsprintf/vsprintf/printf('%s', ES::X). Matches prior unclaim note (VmSprintf::argToString +sprintf_enum_case.phpt).No PR needed.