Regression: xml_parser_set_option(..., null) silent true — Zend E_WARNING string\|int\|bool (ext/xml/xml.c)

[PurHur]

Category

Regression · php-src-strict · typed option value Warning

Problem

xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, null) returns true on both Zend 8.4 and the VM, but Zend also emits an E_WARNING that argument #3 must be string|int|bool. The VM is silent (null is accepted and cast via (bool)).

Probed 2026-08-13 (php:8.4-cli -n vs PHP_COMPILER_PROFILE=8.4 php bin/vm.php):

Repro	Zend 8.4	VM PROFILE=8.4
xml_parser_set_option($p, XML_OPTION_CASE_FOLDING, null)	Warning: Argument #3 ($value) must be of type string|int|bool, null given → true	true (no warning)

php-src reference

• php/php-src ext/xml/xml.c — PHP_FUNCTION(xml_parser_set_option) value zpp / type check
• php/php-src ext/xml/xml.stub.php — $value typed string|int|bool

PHP implementation target

• ext/xml/xml_parser_set_option.php — reject/warn on TYPE_NULL before calling XmlParserHandlers::setOption
• ext/xml/XmlParserHandlers.php — keep option apply logic; warning belongs at the builtin boundary
• Prefer PHP warning emission helpers already used by other ext/xml builtins; no new C

Repro

./script/docker-exec.sh -- bash -lc 'cat >/tmp/xml_opt.php <<'\''PHP'\''
<?php
error_reporting(E_ALL);
$p = xml_parser_create();
try { var_export(xml_parser_set_option($p, XML_OPTION_CASE_FOLDING, null)); } catch (Throwable $e) { echo get_class($e), ": ", $e->getMessage(); }
xml_parser_free($p);
PHP
PHP_COMPILER_PROFILE=8.4 php bin/vm.php /tmp/xml_opt.php'

Done when

• Null $value emits Zend-matching E_WARNING text and still returns true (php-src behavior)
• Non-null string|int|bool paths unchanged
• Compliance/unit guard; php-src-strict

[PurHur]

claim: PHP Compiler Ext — DOM & XML — starting this run

[PurHur]

merged: #30752

Verification (php-src-strict)

• PHP_COMPILER_PROFILE=8.4 php bin/vm.php test/repro/issue_30652_xml_parser_set_option_null.php → E_WARNING xml_parser_set_option(): Argument #3 ($value) must be of type string|int|bool, null given then true
• PHP_COMPILER_PROFILE=8.2 / unset PROFILE → silent true (Zend 8.2)
• vendor/bin/phpunit --filter XmlParserSetOptionNull30652Test → OK 5/5
• sibling XML unit tests (XmlModuleSkeletonTest + #30651) → OK 18/18
• php script/bootstrap-inventory.php --check → OK 7386/7386

Gates recorded this run

• make bootstrap-selfhost-link: started; stale gen-0 sidecars → Zend gen-0 fallback (Trust: refresh gen-0 spine sidecar — stamp ≠ spine SHA; link falls back to Zend (prelinked/bootstrap-gen0) #28998). Not a regression from this XML warning. Did not wait for the full link.
• release-readiness / north-star5-verify-fast: not re-run (change is ext/xml VM builtin only).

php-src: ext/xml/xml.c PHP_FUNCTION(xml_parser_set_option). PHP: ext/xml/xml_parser_set_option.php.