callable-stringstring and accept it.
References:
- PHPStan TypeNodeResolver callable-string resolves to string&CallableType| Analyzer | Version | Result | Diagnostics |
|---|---|---|---|
| phan | 6.0.10Phan 6.0.10 php-ast version 1.1.3 PHP version used to run Phan: 8.5.11 | Enforced | phpdoc_advanced_fallback_callable_string.php:45: Call to undeclared function definitely_not_a_function in callable [PhanUndeclaredFunctionInCallable] phpdoc_advanced_fallback_callable_string.php:48: Call to undeclared function stdClass in callable [PhanUndeclaredFunctionInCallable]
|
| phpstan | 2.3.1PHPStan - PHP Static Analysis Tool 2.3.1 | Enforced reported Lv.5+ | phpdoc_advanced_fallback_callable_string.php:45: Parameter #1 $value of function Conformance\Tests\PhpdocAdvancedFallbackCallableString\acceptsCallableString expects callable-string, 'definitely_not_a…' given. [reported-from-level=5] phpdoc_advanced_fallback_callable_string.php:48: Parameter #1 $value of function Conformance\Tests\PhpdocAdvancedFallbackCallableString\acceptsCallableString expects callable-string, 'stdClass' given. [reported-from-level=5] With strict-rulesphpdoc_advanced_fallback_callable_string.php:45: Parameter #1 $value of function Conformance\Tests\PhpdocAdvancedFallbackCallableString\acceptsCallableString expects callable-string, 'definitely_not_a…' given. phpdoc_advanced_fallback_callable_string.php:48: Parameter #1 $value of function Conformance\Tests\PhpdocAdvancedFallbackCallableString\acceptsCallableString expects callable-string, 'stdClass' given.
|
| psalm | 6.20.0Psalm 6.20.0@804f03c0c183d149fcd4b8c7c0c9b3fbf836d34c next: 7.0.0-rc2 |
Enforced | phpdoc_advanced_fallback_callable_string.php:45: Argument 1 of Conformance\Tests\PhpdocAdvancedFallbackCallableString\acceptsCallableString expects callable-string, but 'definitely_not_a_function' provided [InvalidArgument] phpdoc_advanced_fallback_callable_string.php:48: Argument 1 of Conformance\Tests\PhpdocAdvancedFallbackCallableString\acceptsCallableString expects callable-string, but stdClass::class provided [InvalidArgument]
|
| mago | 1.57.0mago 1.57.0 | Enforced | phpdoc_advanced_fallback_callable_string.php:45: Possible argument type mismatch for argument #1 of `Conformance\Tests\PhpdocAdvancedFallbackCallableString\acceptsCallableString`: expected `callable-string`, but possibly received `string('definitely_not_a_function')`. [possibly-invalid-argument]
phpdoc_advanced_fallback_callable_string.php:48: Possible argument type mismatch for argument #1 of `Conformance\Tests\PhpdocAdvancedFallbackCallableString\acceptsCallableString`: expected `callable-string`, but possibly received `class-string('stdClass')`. [possibly-invalid-argument]
|
| mir | 0.87.0mir 0.87.0 | Enforced | phpdoc_advanced_fallback_callable_string.php:45: UndefinedFunction: Function definitely_not_a_function() is not defined [MIR0003] phpdoc_advanced_fallback_callable_string.php:48: InvalidArgument: Argument $value of acceptsCallableString() expects 'callable-string', got 'class-string<stdClass>' [MIR0201]
|
| phpantom | 0.11.1phpantom_lsp 0.11.1 | Partly enforced (1/2) | phpdoc_advanced_fallback_callable_string.php:48: Argument 1 ($value) expects callable-string, got class-string<stdClass> [type_mismatch_argument]
|
| intelephense | 1.18.5intelephense 1.18.5 | Not enforced | No diagnostics reported.
|
| phpactor | 2026.10.07.0Phpactor 2026.10.07.0 | Not enforced | No diagnostics reported.
|
| phpy | 1.0.19409phpy 1.0.19409 | Not enforced | No diagnostics reported.
|
| qodana | 262.10968.76PhpStorm 262.10968.76 | Widened to string | No diagnostics reported.
Notes: Checked as plain `string`: a wrong type is reported as "Expected parameter of type 'string'", and a name that is no function, and a class name, pass, exactly as for `@param string`. Quick Documentation still shows `callable-string`, so the spelling is recognised and only the refinement is dropped. |
| noverify | 0.5.5NoVerify, version 0.5.5: built on: 2025.04.22 14:36:46 OS: r-kuchinskas arm64 Commit: 4774b82f8adc53fbef38f95e97af4b953b4d1529 | Not enforced | No diagnostics reported.
|
| steins | 0.1.8steins 0.1.8 (2026-09-21 revision 76306a9) | Widened to string | No diagnostics reported.
Notes: `callable-string` lowers to `ContractTy::StrOpaque` (ADR-0038), so Steins never checks that the string names an existing function or method — it accepts any string. |
| phpstan-strict | 2.3.1PHPStan - PHP Static Analysis Tool 2.3.1 | Enforced | phpdoc_advanced_fallback_callable_string.php:45: Parameter #1 $value of function Conformance\Tests\PhpdocAdvancedFallbackCallableString\acceptsCallableString expects callable-string, 'definitely_not_a…' given. phpdoc_advanced_fallback_callable_string.php:48: Parameter #1 $value of function Conformance\Tests\PhpdocAdvancedFallbackCallableString\acceptsCallableString expects callable-string, 'stdClass' given.
|
| psalm-next | 7.0.0-rc2Psalm 7.0.0-rc2@20339e3fe5b8d03bcd8061030eb2a83ad50e5783 | Enforced | phpdoc_advanced_fallback_callable_string.php:45: Argument 1 of Conformance\Tests\PhpdocAdvancedFallbackCallableString\acceptsCallableString expects callable-string, but 'definitely_not_a_function' provided [InvalidArgument] phpdoc_advanced_fallback_callable_string.php:48: Argument 1 of Conformance\Tests\PhpdocAdvancedFallbackCallableString\acceptsCallableString expects callable-string, but stdClass::class provided [InvalidArgument]
|
<?php
declare(strict_types=1);
namespace Conformance\Tests\PhpdocAdvancedFallbackCallableString;
/**
* `callable-string`
*
* A string that names something callable, so the refinement is only meaningful
* for an analyzer that knows which function names exist. Analyzers that model
* it reject a name nothing is declared under; others fall back to plain
* `string` and accept it.
*
* References:
* - PHPStan TypeNodeResolver `callable-string` resolves to string&CallableType
*/
/**
* @return callable-string
*/
function returnsCallableString() // T: callable-string
{
return 'strlen'; // V
}
function acceptsString(string $value): void
{
}
/**
* @param callable-string $value
*/
function acceptsCallableString($value): void // T: callable-string
{
}
// A `callable-string` value always satisfies a native `string` parameter.
acceptsString(returnsCallableString()); // V
// The name of an existing function satisfies the parameter.
acceptsCallableString('strlen'); // V
// A name nothing is declared under does not.
acceptsCallableString('definitely_not_a_function'); // E?: an undeclared name is not a callable-string
// Neither does the name of a class, which is a string PHP will not call.
acceptsCallableString(\stdClass::class); // E?: a class-string is not a callable-string