Stdlib: strip_tags()/htmlspecialchars() enum case operands must TypeError (ext/standard/string.c, php-src-strict)

[PurHur]

Category

stdlib

Problem

strip_tags() and htmlspecialchars() reject non-strings with LogicException, not Zend’s TypeError. Backed enum cases must not be coerced via backing string (php-src-strict, same rule as #5780 / #5524).

Blocked/partially masked by #5896 when the call is a void statement (strip_tags(E::A); never validates).

php-src reference

• php/php-src ext/standard/string.c — PHP_FUNCTION(strip_tags), PHP_FUNCTION(htmlspecialchars) (Z_PARAM_STR / zend_parse_parameters)

Repro (add test/repro-maintainer/parity_strip_tags_enum_typeerror.php)

<?php
enum E: string { case A = 'a'; }
try {
    $r = strip_tags(E::A);
} catch (Throwable $e) {
    echo 'strip_tags ', get_class($e), ': ', $e->getMessage(), PHP_EOL;
}
try {
    htmlspecialchars(E::A);
} catch (Throwable $e) {
    echo 'htmlspecialchars ', get_class($e), ': ', $e->getMessage(), PHP_EOL;
}

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php8.2 test/repro-maintainer/parity_strip_tags_enum_typeerror.php
php bin/vm.php test/repro-maintainer/parity_strip_tags_enum_typeerror.php'

Builtin	Zend	VM today
strip_tags(E::A)	TypeError: … must be of type string, E given	LogicException: only supports strings… (or silent if #5896)
htmlspecialchars(E::A)	TypeError	same pattern in htmlspecialchars.php

Scope

Path	Work
ext/standard/strip_tags.php, htmlspecialchars.php	VmString::coerceStringBuiltinArg() / EnumCaseSupport::isEnumCaseVariable() — reject enum cases with TypeError
ext/standard/VmString.php	Shared guard (PHP-in-PHP)
JIT	Mirror in lib/JIT/JitStringBuiltinArg.php when lowered

Done when

• VM (+ JIT/AOT if covered) throws TypeError matching Zend message shape for enum case operands
• test/compliance/cases/stdlib/strip_tags_enum_typeerror.phpt (and htmlspecialchars sibling) green
• Depends on Stdlib: VM builtins skip arg validation when return is discarded (returnVar null early-return) #5896 for void-statement calls

Related

• Stdlib: VM builtins skip arg validation when return is discarded (returnVar null early-return) #5896, Stdlib: string builtins must TypeError on enum case operands (ext/standard/string.c) #5524, Stdlib: strip_tags() — TypeError for non-string $string (ext/standard/string.c parity) #4593, Stdlib: builtin wrong-type parameters — TypeError not LogicException (ext/standard parity) #4178

[PurHur]

claim: PHP Compiler STD Lib — starting this run

[PurHur]

Unclaiming: strip_tags()/htmlspecialchars() enum TypeError already green on master (#6612). VM + compliance html_enum_typeerror*.phpt pass. Closing as duplicate unless repro differs.

[PurHur]

Already fixed — closing (lane C audit 2026-07-18)

Verified on current master — Zend and php bin/vm.php both throw TypeError for strip_tags(E::A) / htmlspecialchars(E::A) (enum case, not LogicException / backing coerce). Matches prior unclaim (#6612).

No PR needed.