Stdlib: mb_send_mail() — multibyte MIME mail send missing (ext/mbstring/mbstring.c)

[PurHur]

Category

stdlib · php-src-strict

Problem

mb_send_mail() is not registered. Zend exposes it from ext/mbstring for sending RFC-compliant mail with multibyte headers/bodies (pairs with mail() #3285 and MIME helpers #6038). Web apps and CLI scripts that call mb_send_mail() fail today.

php-src reference

• php/php-src ext/mbstring/mbstring.c — PHP_FUNCTION(mb_send_mail)
• php/php-src ext/standard/mail.c — underlying sendmail/MTA path reused by mbstring

Repro (failure today)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php -r "var_export(function_exists(\"mb_send_mail\")); echo \"\\n\";"
'
# bool(false)

Compare Zend (ext/mbstring loaded):

./script/docker-exec.sh -- bash -lc 'php -r "var_export(function_exists(\"mb_send_mail\")); echo \"\\n\";"'
# bool(true)

Scope

Module	Path
Extension	ext/mbstring/mb_send_mail.php (new), wire in ext/mbstring/Module.php
VM	Delegate to mail() once #3285 exists, or thin sendmail wrapper matching php-src header encoding
Encoding	Reuse mb_internal_encoding() / MIME helpers from #4636 / #6038
Tests	test/compliance/cases/stdlib/mb_send_mail.phpt (mock/skip when sendmail unavailable)

PHP-in-PHP first: PHP implementation in ext/mbstring/; avoid permanent C-only mail tables in runtime/*.c.

Done when

• function_exists('mb_send_mail') true when mbstring module is loaded
• Argument count / type errors match Zend (TypeError on non-string recipients/subject/body; enum-case operands rejected under php-src-strict)
• Optional $additional_headers / $additional_params semantics match php-src for ASCII + UTF-8 subjects
• Compliance test green or @group sendmail skipped with documented reason

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/vm.php -r "var_export(function_exists(\"mb_send_mail\"));"'
./script/ci-fast.sh --filter mb_send_mail

[PurHur]

claim: PHP Compiler Ext — I/O & Crypto — starting this run

[PurHur]

Merged via PR #18783.

Implementation: PHP-in-PHP mb_send_mail() in ext/mbstring/ — MbstringMailProfile (language mail charset/encodings), VmMbstring::prepareSendMail() (RFC 2047 subject + MIME headers + body transfer encoding), delegates to compiler mail() transport.

php-src ref: ext/mbstring/mbstring.c — PHP_FUNCTION(mb_send_mail)

Verification (VM):

php bin/vm.php test/repro/maintainer_gap_mb_send_mail.php  # ok
vendor/bin/phpunit --filter 'MbSendMailTest|mb_send_mail'  # OK (7 tests)
php script/bootstrap-inventory.php --check                 # OK 4844/4844

JIT/AOT lowering deferred (VM-first per capability matrix).