Basic interface compatibility checks

Group: Object compatibility · Category: language · File: objects_interface_compat.php

References: - PHP object type compatibility

Analyzer results

Analyzer	Version	Result	Diagnostics
phan	6.0.7Phan 6.0.7 php-ast version 1.1.3 PHP version used to run Phan: 8.5.9	Pass	objects_interface_compat.php:41: Argument 1 ($value) is new AnonymousUser() of type \Conformance\Tests\ObjectsInterfaceCompat\AnonymousUser but \Conformance\Tests\ObjectsInterfaceCompat\takesHasName() takes \Conformance\Tests\ObjectsInterfaceCompat\HasName defined at /Users/megurine/repo/php/php-typing-conformance/conformance/tests/objects_interface_compat.php:36 [PhanTypeMismatchArgumentReal]
phpstan	2.2.15PHPStan - PHP Static Analysis Tool 2.2.15	Pass reported Lv.5+	objects_interface_compat.php:41: Parameter #1 $value of function Conformance\Tests\ObjectsInterfaceCompat\takesHasName expects Conformance\Tests\ObjectsInterfaceCompat\HasName, Conformance\Tests\ObjectsInterfaceCompat\AnonymousUser given. [reported-from-level=5] With strict-rules objects_interface_compat.php:41: Parameter #1 $value of function Conformance\Tests\ObjectsInterfaceCompat\takesHasName expects Conformance\Tests\ObjectsInterfaceCompat\HasName, Conformance\Tests\ObjectsInterfaceCompat\AnonymousUser given.
psalm	6.18.0Psalm 6.18.0@536dd6236b39a5115385b0307b42d6d1ad431a02 next: 7.0.0-beta22	Pass	objects_interface_compat.php:41: Argument 1 of Conformance\Tests\ObjectsInterfaceCompat\takesHasName expects Conformance\Tests\ObjectsInterfaceCompat\HasName, but Conformance\Tests\ObjectsInterfaceCompat\AnonymousUser provided [InvalidArgument]
mago	1.50.0mago 1.50.0	Pass	objects_interface_compat.php:41: Possible argument type mismatch for argument #1 of `Conformance\Tests\ObjectsInterfaceCompat\takesHasName`: expected `Conformance\Tests\ObjectsInterfaceCompat\HasName`, but possibly received `Conformance\Tests\ObjectsInterfaceCompat\AnonymousUser`. [possibly-invalid-argument]
mir	0.78.0mir 0.78.0	Pass	objects_interface_compat.php:41: InvalidArgument: Argument $value of takesHasName() expects 'Conformance\Tests\ObjectsInterfaceCompat\HasName', got 'Conformance\Tests\ObjectsInterfaceCompat\AnonymousUser' [MIR0201]
phpantom	0.10.0phpantom_lsp 0.10.0	Pass	objects_interface_compat.php:41: Argument 1 ($value) expects Conformance\Tests\ObjectsInterfaceCompat\HasName, got Conformance\Tests\ObjectsInterfaceCompat\AnonymousUser [type_mismatch_argument]
intelephense	1.18.5intelephense 1.18.5	Pass	objects_interface_compat.php:41: Expected type 'Conformance\Tests\ObjectsInterfaceCompat\HasName'. Found 'Conformance\Tests\ObjectsInterfaceCompat\AnonymousUser'. [P1006]
phpactor	2026.06.23.0Phpactor 2026.06.23.0	Fail	No diagnostics reported. Expectation diff Line 41: Expected 1 error(s)
phpy	1.0.19274phpy 1.0.19274	Pass	objects_interface_compat.php:41: Argument '1' passed to Conformance\Tests\ObjectsInterfaceCompat\takesHasName() is expected to be of type Conformance\Tests\ObjectsInterfaceCompat\HasName, Conformance\Tests\ObjectsInterfaceCompat\AnonymousUser given
qodana	262.9437.196Qodana 262.9437.196	Pass	objects_interface_compat.php:41: Parameter 'new AnonymousUser()' 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 41: Expected 1 error(s)
steins	0.1.8steins 0.1.8 (2026-09-21 revision 76306a9)	Pass	objects_interface_compat.php:41: argument new AnonymousUser() to takesHasName() cannot become Conformance\Tests\ObjectsInterfaceCompat\HasName $value — proven TypeError (strict mode) [type.argument-mismatch]
phpstan-strict	2.2.15PHPStan - PHP Static Analysis Tool 2.2.15	Pass	objects_interface_compat.php:41: Parameter #1 $value of function Conformance\Tests\ObjectsInterfaceCompat\takesHasName expects Conformance\Tests\ObjectsInterfaceCompat\HasName, Conformance\Tests\ObjectsInterfaceCompat\AnonymousUser given.
psalm-next	7.0.0-beta22Psalm 7.0.0-beta22@de27e5724ee5997a1e3baee4d394ca6f4e46eba0	Pass	objects_interface_compat.php:41: Argument 1 of Conformance\Tests\ObjectsInterfaceCompat\takesHasName expects Conformance\Tests\ObjectsInterfaceCompat\HasName, but Conformance\Tests\ObjectsInterfaceCompat\AnonymousUser provided [InvalidArgument]

Source

<?php

declare(strict_types=1);

namespace Conformance\Tests\ObjectsInterfaceCompat;

/**
 * Basic interface compatibility checks.
 *
 * References:
 * - PHP object type compatibility
 */

interface HasName
{
    public function name(): string;
}

final class User implements HasName
{
    #[\Override]
    public function name(): string
    {
        return 'user';
    }
}

final class AnonymousUser
{
    public function id(): int
    {
        return 1;
    }
}

function takesHasName(HasName $value): void
{
}

takesHasName(new User());
takesHasName(new AnonymousUser()); // E: object does not implement HasName