Stdlib: mb_strlen() string:/encoding: named parameters rejected (ext/mbstring/mbstring.c)

[PurHur]

Category

stdlib · php-src-strict

Problem

php-src names mb_strlen() parameters string and encoding. Zend accepts:

mb_strlen(string: 'é', encoding: 'UTF-8'); // int(1)

VM rejects with Unknown named parameter $string. Positional mb_strlen('é', 'UTF-8') works.

php-src reference

• php/php-src ext/mbstring/mbstring.c — PHP_FUNCTION(mb_strlen)
• php/php-src ext/mbstring/mbstring.stub.php
• Named binding: php/php-src Zend/zend_compile.c

Repro (failure today)

<?php
echo mb_strlen(string: 'é', encoding: 'UTF-8'), "\n";

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php repro.php                        # Zend: 1
php bin/vm.php repro.php               # Fatal: Unknown named parameter $string
'

Call	Zend PHP 8.2+	VM today
mb_strlen(string: 'é', encoding: 'UTF-8')	1	fatal ❌
positional	1	1 ✅

Scope (this repo)

Path	Work
lib/BuiltinParamNames.php / patches	Register string/encoding for mb_strlen
lib/Compiler.php, lib/VM/NamedArgs.php, lib/JIT/NamedArgs.php	Named binding
ext/types/mb_strlen.php or ext/mbstring/	handler after wiring
Tests	test/compliance/cases/stdlib/mb_strlen_named.phpt

PHP-in-PHP first — no new runtime/*.c.

Done when

• Repro prints 1 on VM (php-src-strict)
• Omitted encoding: uses internal encoding like positional form
• ./script/ci-fast.sh --filter mb_strlen_named green

Related

• Stdlib: mb_trim()/mb_ltrim()/mb_rtrim() — PHP 8.4 named characters param + new builtins (ext/mbstring/mbstring.c) #9977 mb_trim characters: · Stdlib: mb_convert_encoding / mb_detect_encoding (ext/mbstring parity) #3075 mb_convert_encoding · Epic: Self-host critical path — compiler compiles itself (M3→M5) #1492

[PurHur]

claim: PHP Runtime → PHP — batch (issues #10050, #10044)

[PurHur]

Merged via #15278. Verification: php bin/vm.php -r 'echo mb_strlen(string: "é", encoding: "UTF-8");' prints 1. Named string:/encoding: wired via BuiltinParamNames (PHP-in-PHP).