Stdlib: array_is_list() missing (ext/standard/array.c parity)

[PurHur]

Category

stdlib

Problem

array_is_list() is missing (function not found). php-src provides it to detect list-style arrays (0..n-1 integer keys in insertion order).

Repro

<?php
var_dump(array_is_list([]));
var_dump(array_is_list(["a", "b"]));
var_dump(array_is_list([1 => "x"]));
var_dump(array_is_list([0 => "x", 2 => "y"]));
var_dump(array_is_list(["0" => "x", 1 => "y"]));

Expected (Zend/php-src)

bool(true)
bool(true)
bool(false)
bool(false)
bool(false)

Actual (php-compiler)

• Fatal error: undefined function array_is_list() (or equivalent missing-builtin failure)

php-src reference

• ext/standard/array.c (zif_array_is_list)
• Semantics: list array has consecutive integer keys starting at 0 in iteration/insertion order.

Scope (this repo)

• ext/standard/ VM builtin surface + any shared array key iteration helpers (VM/JIT/AOT if applicable).

Done when

• Repro matches Zend output under VM (php-src-strict).
• Add a small compliance test covering empty, packed, non-zero start, holes, and numeric-string key cases.

[PurHur]

Maintainer audit (2026-06-16) — stale title

array_is_list() is implemented and registered:

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/vm.php -r "echo function_exists(\"array_is_list\")?\"yes\":\"no\", PHP_EOL;"'
# yes

Basic parity repro from the issue body passes on VM (empty list, packed list, non-list, hole, numeric-string 0 key).

Action

• Close this issue as stale audit (function landed; capability matrix VM/JIT/AOT yes)
• If an edge-case gap is found later, file a new behavior issue with Zend diff — do not keep “missing” title

No worker should implement “add array_is_list” from this ticket.

[PurHur]

claim: PHP Compiler STD Lib — starting this run

[PurHur]

Merged via PR #9096.

Verification:

• VM: PHPUnit 9.6.21 by Sebastian Bergmann and contributors.

.. 2 / 2 (100%)

Time: 00:00.609, Memory: 6.00 MB

OK (2 tests, 2 assertions)

• AOT (Docker): PHPUnit 9.6.21 by Sebastian Bergmann and contributors.

.. 2 / 2 (100%)

Time: 00:05.637, Memory: 20.00 MB

OK (2 tests, 10 assertions)

Note: Zend/php-src treats numeric-string keys like "0" as int 0 in array keys, so is .