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External signature support through companion helper files

Group: Stubs and external signatures · Category: ecosystem · File: stubs_external_signature_support.php

References: - python-typing distribution / external type information inspiration - PHP analyzer support for separately supplied symbols

Analyzer results

AnalyzerVersionResultDiagnostics
phan 6.0.10Phan 6.0.10 php-ast version 1.1.3 PHP version used to run Phan: 8.5.11 Pass 
stubs_external_signature_support.php:37: Argument 1 ($clock) is new InvalidClock() of type \Conformance\Tests\StubsExternalSignatureSupport\InvalidClock but \Conformance\Tests\StubsExternalSignatureSupport\takesClock() takes \Conformance\Tests\StubsExternalSignatureSupport\ExternalClock defined at /Users/megurine/repo/php/php-typing-conformance/conformance/tests/stubs_external_signature_support.php:32 [PhanTypeMismatchArgumentReal]
phpstan 2.3.1PHPStan - PHP Static Analysis Tool 2.3.1 Pass reported Lv.5+ 
stubs_external_signature_support.php:37: Parameter #1 $clock of function Conformance\Tests\StubsExternalSignatureSupport\takesClock expects Conformance\Tests\StubsExternalSignatureSupport\ExternalClock, Conformance\Tests\StubsExternalSignatureSupport\InvalidClock given. [reported-from-level=5]
With strict-rules
stubs_external_signature_support.php:37: Parameter #1 $clock of function Conformance\Tests\StubsExternalSignatureSupport\takesClock expects Conformance\Tests\StubsExternalSignatureSupport\ExternalClock, Conformance\Tests\StubsExternalSignatureSupport\InvalidClock given.
psalm 6.20.0Psalm 6.20.0@804f03c0c183d149fcd4b8c7c0c9b3fbf836d34c
next: 7.0.0-rc2		 Pass 
stubs_external_signature_support.php:37: Argument 1 of Conformance\Tests\StubsExternalSignatureSupport\takesClock expects Conformance\Tests\StubsExternalSignatureSupport\ExternalClock, but Conformance\Tests\StubsExternalSignatureSupport\InvalidClock provided [InvalidArgument]
mago 1.57.0mago 1.57.0 Pass 
stubs_external_signature_support.php:37: Possible argument type mismatch for argument #1 of `Conformance\Tests\StubsExternalSignatureSupport\takesClock`: expected `Conformance\Tests\StubsExternalSignatureSupport\ExternalClock`, but possibly received `Conformance\Tests\StubsExternalSignatureSupport\InvalidClock`. [possibly-invalid-argument]
mir 0.87.0mir 0.87.0 Pass 
stubs_external_signature_support.php:37: InvalidArgument: Argument $clock of takesClock() expects 'Conformance\Tests\StubsExternalSignatureSupport\ExternalClock', got 'Conformance\Tests\StubsExternalSignatureSupport\InvalidClock' [MIR0201]
phpantom 0.11.1phpantom_lsp 0.11.1 Pass 
stubs_external_signature_support.php:37: Argument 1 ($clock) expects Conformance\Tests\StubsExternalSignatureSupport\ExternalClock, got Conformance\Tests\StubsExternalSignatureSupport\InvalidClock [type_mismatch_argument]
intelephense 1.18.5intelephense 1.18.5 Pass 
stubs_external_signature_support.php:37: Expected type 'Conformance\Tests\StubsExternalSignatureSupport\ExternalClock'. Found 'Conformance\Tests\StubsExternalSignatureSupport\InvalidClock'. [P1006]
phpactor 2026.10.07.0Phpactor 2026.10.07.0 Fail

No diagnostics reported.

Expectation diff
Line 37: Expected 1 error(s)
phpy 1.0.19409phpy 1.0.19409 Pass 
stubs_external_signature_support.php:37: Argument '1' passed to Conformance\Tests\StubsExternalSignatureSupport\takesClock() is expected to be of type Conformance\Tests\StubsExternalSignatureSupport\ExternalClock, Conformance\Tests\StubsExternalSignatureSupport\InvalidClock given
qodana 262.10968.76PhpStorm 262.10968.76 Pass 
stubs_external_signature_support.php:37: Parameter 'new InvalidClock()' type is not compatible with declaration [PhpParamsInspection]
noverify 0.5.5NoVerify, version 0.5.5: built on: 2025.04.22 14:36:46 OS: r-kuchinskas arm64 Commit: 4774b82f8adc53fbef38f95e97af4b953b4d1529 Fail

No diagnostics reported.

Expectation diff
Line 37: Expected 1 error(s)
steins 0.1.8steins 0.1.8 (2026-09-21 revision 76306a9) Pass 
stubs_external_signature_support.php:37: argument new InvalidClock() to takesClock() cannot become Conformance\Tests\StubsExternalSignatureSupport\ExternalClock $clock — proven TypeError (strict mode) [type.argument-mismatch]
phpstan-strict 2.3.1PHPStan - PHP Static Analysis Tool 2.3.1 Pass 
stubs_external_signature_support.php:37: Parameter #1 $clock of function Conformance\Tests\StubsExternalSignatureSupport\takesClock expects Conformance\Tests\StubsExternalSignatureSupport\ExternalClock, Conformance\Tests\StubsExternalSignatureSupport\InvalidClock given.
psalm-next 7.0.0-rc2Psalm 7.0.0-rc2@20339e3fe5b8d03bcd8061030eb2a83ad50e5783 Pass 
stubs_external_signature_support.php:37: Argument 1 of Conformance\Tests\StubsExternalSignatureSupport\takesClock expects Conformance\Tests\StubsExternalSignatureSupport\ExternalClock, but Conformance\Tests\StubsExternalSignatureSupport\InvalidClock provided [InvalidArgument]

Source

<?php

declare(strict_types=1);

namespace Conformance\Tests\StubsExternalSignatureSupport;

/**
 * External signature support through companion helper files.
 *
 * References:
 * - python-typing distribution / external type information inspiration
 * - PHP analyzer support for separately supplied symbols
 */

final class ValidClock implements ExternalClock
{
    #[\Override]
    public function timestamp(): int
    {
        return 1700000000;
    }
}

final class InvalidClock
{
    public function time(): string
    {
        return 'now';
    }
}

function takesClock(ExternalClock $clock): void
{
}

takesClock(new ValidClock());
takesClock(new InvalidClock()); // E: object does not satisfy the companion external signature

Support: _stubs_external_signature_support.php

<?php

declare(strict_types=1);

namespace Conformance\Tests\StubsExternalSignatureSupport;

interface ExternalClock
{
    public function timestamp(): int;
}