Stdlib: ArrayObject::getIteratorClass() returns null after void setIteratorClass() in expression (ext/spl/spl_array.c)

Problem

After $ao->setIteratorClass('ArrayIterator'), the next var_export($ao->getIteratorClass(), true) must be 'ArrayIterator'. On this compiler the first getIteratorClass() used as an expression after the void setter returns NULL (though a later call or direct echo may show the correct string).

Reproduces with declare(strict_types=1); see test/repro/maintainer_gap_arrayobject_get_iterator_class.php for the broader var_export sequence.

Verified 2026-06-23 on VM (php bin/vm.php).

php-src reference

ext/spl/spl_array.c — spl_array_setIteratorClass / spl_array_getIteratorClass
Likely VM return-value slot not cleared between void method and subsequent method call (ext/spl/ArrayObjectBuiltin.php early returnVar guard on setIteratorClass)

Repro

test/repro/maintainer_gap_arrayobject_getiterator_after_set.php

php test/repro/maintainer_gap_arrayobject_getiterator_after_set.php           # PASS exit 0
php bin/vm.php test/repro/maintainer_gap_arrayobject_getiterator_after_set.php  # FAIL exit 255

Implementation hint

ext/spl/ArrayObjectBuiltin.php — do not bail out of setIteratorClass when returnVar is null before persisting class; void methods must not poison the next call's return slot
ext/spl/SplArrayStorage.php — iterator class bag already correct when setter runs
PHP-in-PHP; no new runtime/*.c

Done when

Both repro scripts exit 0 on VM
Rejected setIteratorClass('stdClass') after valid set still leaves ArrayIterator (Stdlib: SPL core structures — ArrayObject / SplQueue / SplStack / SplObjectStorage (ext/spl parity) #3330 SPL umbrella)
Compliance guard under test/compliance/cases/stdlib/ or spl/
./script/ci-fast.sh green

Links

refs Epic: Self-host critical path — compiler compiles itself (M3→M5) #1492 · related Stdlib: SPL core structures — ArrayObject / SplQueue / SplStack / SplObjectStorage (ext/spl parity) #3330 · Stdlib: ArrayObject::__construct() missing — parent::__construct and new ArrayObject($array) fatal (ext/spl/spl_array.c) #10169

claim: cursor-agent-lane-c — starting this run (ArrayObject getIteratorClass after void setIteratorClass; ext/spl/spl_array.c)

Merged via #10800

Fix: filterDeadVoidStatementMethodCallProducers drops dead void MethodCall preludes before sibling method inline call-args; setIteratorClass no longer returns early when returnVar is null.

Verification:

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php test/repro/maintainer_gap_arrayobject_getiterator_after_set.php
php bin/vm.php test/repro/maintainer_gap_arrayobject_get_iterator_class.php
./vendor/bin/phpunit --filter arrayobject_getiterator_after_set
'

Fix ArrayObject getIteratorClass() after void setIteratorClass() (#10778

Fix sibling MethodCall inline call-arg producer filter (#10816). (#10820

Fix sibling MethodCall inline call-arg wiring for typed returns (#10816…

Merge pull request #12687 from PurHur/agent/stdlib-ukey-arrayobject-b…

claim: cursor-agent-lane-a — regression fix: var_export after void setIteratorClass still misbinds getIteratorClass to true on master

Merged via #16310 — regression fix for var_export(\$ao->getIteratorClass(), true) after void setIteratorClass().

Verification:

vendor/bin/phpunit --filter "ArrayObjectGetIterator|arrayobject_getiterator|arrayobject_iterator_class" — OK (5 tests)
php bin/vm.php test/repro/maintainer_gap_arrayobject_getiterator_after_set.php — prints 'ArrayIterator'

Compiler: fix var_export after void setIteratorClass misbind (#10778) (…

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Stdlib: ArrayObject::getIteratorClass() returns null after void setIteratorClass() in expression (ext/spl/spl_array.c) #10778

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Stdlib: ArrayObject::getIteratorClass() returns null after void setIteratorClass() in expression (ext/spl/spl_array.c) #10778

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Done when

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PurHur commented on Jun 23, 2026

PurHur commented on Jun 23, 2026

PurHur commented on Jul 5, 2026

PurHur commented on Jul 5, 2026

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