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Basic backed enum compatibility checks

Group: Enums · Category: language · File: enums_backed_cases.php

References: - PHP native enums

Analyzer results

AnalyzerVersionResultDiagnostics
phan 6.0.7Phan 6.0.7 php-ast version 1.1.3 PHP version used to run Phan: 8.5.9 Pass 
enums_backed_cases.php:25: Argument 1 ($status) is 'active' of type string but \Conformance\Tests\EnumsBackedCases\takesStatus() takes \Conformance\Tests\EnumsBackedCases\Status defined at /Users/megurine/repo/php/php-typing-conformance/conformance/tests/enums_backed_cases.php:20 [PhanTypeMismatchArgumentReal]
phpstan 2.2.8PHPStan - PHP Static Analysis Tool 2.2.8 Pass reported Lv.5+ 
enums_backed_cases.php:25: Parameter #1 $status of function Conformance\Tests\EnumsBackedCases\takesStatus expects Conformance\Tests\EnumsBackedCases\Status, string given. [identifier=argument.type] [reported-from-level=5]
With strict-rules
enums_backed_cases.php:25: Parameter #1 $status of function Conformance\Tests\EnumsBackedCases\takesStatus expects Conformance\Tests\EnumsBackedCases\Status, string given. [identifier=argument.type]
psalm 6.16.1Psalm 6.16.1@f1f5de594dc76faf8784e02d3dc4716c91c6f6ac
next: 7.0.0-beta19		 Pass 
enums_backed_cases.php:25: Argument 1 of Conformance\Tests\EnumsBackedCases\takesStatus expects Conformance\Tests\EnumsBackedCases\Status, but 'active' provided [InvalidArgument]
mago 1.46.0mago 1.46.0 Pass 
enums_backed_cases.php:25: Invalid argument type for argument #1 of `Conformance\Tests\EnumsBackedCases\takesStatus`: expected `enum(Conformance\Tests\EnumsBackedCases\Status)`, but found `string('active')`. [invalid-argument]
mir 0.70.1mir 0.70.1 Pass 
enums_backed_cases.php:25: InvalidArgument: Argument $status of takesStatus() expects 'Conformance\Tests\EnumsBackedCases\Status', got '"active"' [MIR0201]
phpantom 0.9.0phpantom_lsp 0.9.0 Pass 
enums_backed_cases.php:25: Argument 1 ($status) expects Conformance\Tests\EnumsBackedCases\Status, got 'active' [type_mismatch_argument]
intelephense 1.18.5intelephense 1.18.5 Pass 
enums_backed_cases.php:25: Expected type 'Conformance\Tests\EnumsBackedCases\Status'. Found ''active''. [P1006]
phpy 0.2.0phpy 0.2.0 Pass 
enums_backed_cases.php:25: Argument '1' passed to Conformance\Tests\EnumsBackedCases\takesStatus() is expected to be of type Conformance\Tests\EnumsBackedCases\Status, string given
qodana 262.8665.325Qodana 262.8665.325 Pass 
enums_backed_cases.php:25: Parameter ''active'' 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 
enums_backed_cases.php:20: Class or interface named \Conformance\Tests\EnumsBackedCases\Status does not exist [undefinedClass]
enums_backed_cases.php:24: Class constant \Conformance\Tests\EnumsBackedCases\Status::Active does not exist [undefinedConstant]
Expectation diff
Line 25: Expected 1 error(s)
Line 20: Unexpected errors ["Class or interface named \\Conformance\\Tests\\EnumsBackedCases\\Status does not exist [undefinedClass]"]
Line 24: Unexpected errors ["Class constant \\Conformance\\Tests\\EnumsBackedCases\\Status::Active does not exist [undefinedConstant]"]
steins 0.1.5steins 0.1.5 (2026-08-12 revision 39b4cc1) Pass 
enums_backed_cases.php:25: argument "active" to takesStatus() cannot become Conformance\Tests\EnumsBackedCases\Status $status — proven TypeError (strict mode) [type.argument-mismatch]
phpstan-strict 2.2.8PHPStan - PHP Static Analysis Tool 2.2.8 Pass 
enums_backed_cases.php:25: Parameter #1 $status of function Conformance\Tests\EnumsBackedCases\takesStatus expects Conformance\Tests\EnumsBackedCases\Status, string given. [identifier=argument.type]
psalm-next 7.0.0-beta19Psalm 7.0.0-beta19@7e751c06a756fa64dc4c759c09fe4a173afcb433 Pass 
enums_backed_cases.php:25: Argument 1 of Conformance\Tests\EnumsBackedCases\takesStatus expects Conformance\Tests\EnumsBackedCases\Status, but 'active' provided [InvalidArgument]

Source

<?php

declare(strict_types=1);

namespace Conformance\Tests\EnumsBackedCases;

/**
 * Basic backed enum compatibility checks.
 *
 * References:
 * - PHP native enums
 */

enum Status: string
{
    case Active = 'active';
    case Disabled = 'disabled';
}

function takesStatus(Status $status): void
{
}

takesStatus(Status::Active);
takesStatus('active'); // E: raw string is not accepted where Status is required