Stdlib: DateTime::getLastErrors() / DateTimeImmutable::getLastErrors() — parse failure introspection (ext/date/php_datetime.c parity)

[PurHur]

Category

stdlib

Problem

When DateTime::createFromFormat() fails, Zend exposes DateTime::getLastErrors() (and the immutable variant) returning warning_count, warnings, error_count, errors. Frameworks use this for user-facing validation messages. This compiler has no static method and no last-error state.

php-src reference

• php/php-src ext/date/php_datetime.c — PHP_METHOD(DateTime, getLastErrors), global parse-error storage
• php/php-src ext/date/lib/parse_date.c — warning/error accumulation during format parse

Repro (failure today)

<?php
DateTime::createFromFormat('Y-m-d', 'not-a-date');
$e = DateTime::getLastErrors();
var_dump(is_array($e));
var_dump($e['error_count'] ?? null);

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php repro.php
php bin/vm.php repro.php'

Runtime	Result
Zend PHP 8.x	true, error_count >= 1
bin/vm.php	Call to undefined method DateTime::getLastErrors()

Scope (this repo)

Area	Path
VM state	lib/VM/DateTimeSupport.php — thread-local or VM-context last-errors array
Builtins	static getLastErrors on DateTime + DateTimeImmutable
Coupling	populate from createFromFormat lowering (#4659)
Tests	test/compliance/cases/stdlib/datetime_get_last_errors.phpt

Done when

• After failed createFromFormat, getLastErrors() array keys match Zend subset (warning_count, warnings, error_count, errors)
• Successful parse clears/resets errors like Zend
• ./script/ci-fast.sh --filter datetime_get_last_errors green

Related

• Stdlib: DateTime::createFromFormat() / DateTimeImmutable::createFromFormat() — parse formatted strings (ext/date/php_datetime.c parity) #4659 (createFromFormat) · Stdlib: DateTime / DateTimeImmutable OOP (ext/date parity) #3072 · Epic: Self-host critical path — compiler compiles itself (M3→M5) #1492

[PurHur]

claim: worker-lane-b — starting this run

[PurHur]

claim released: worker-lane-b — getLastErrors already green on master (repro test/repro/maintainer_gap_datetime_get_last_errors_error_count.php passes on Zend + bin/vm.php).

[PurHur]

claim: cursor-agent-lane-b — starting this run

[PurHur]

claim released: repro green on master — DateTime::getLastErrors() returns array with error_count=3 after failed createFromFormat on VM matching Zend. Pivoting.

[PurHur]

Closing — done-when satisfied on master

Verified 2026-07-16 after #19609 / current master tip.

DateTime::getLastErrors

Failed createFromFormat populates error_count; success returns false (php-src).

Not a new implementation PR — surface already landed; tracker cleanup for advanced-stdlib batch.