`@phan-side-effect-free`

Group: Advanced PHPDoc types · Category: ecosystem · File: phpdoc_advanced_phan_side_effect_free.php

Phan's purity-adjacent claim on a function. Honouring it means reporting side effects in the body (similar spirit to @psalm-pure / @phpstan-pure). References: - Phan Annotating-Your-Source-Code: @phan-side-effect-free

Analyzer results

Analyzer	Version	Result	Diagnostics
phan	6.0.11Phan 6.0.11 php-ast version 1.1.3 PHP version used to run Phan: 8.5.11	Not enforced	No diagnostics reported. Recognition: spelling resolved Enforcement: 0/1 of the expected violations reported
phpstan	2.3.5PHPStan - PHP Static Analysis Tool 2.3.5	Enforced reported Lv.2+	phpdoc_advanced_phan_side_effect_free.php:22: Impure echo in pure function Conformance\Tests\PhpdocAdvancedPhanSideEffectFree\claimsSideEffectFree(). [reported-from-level=2] With strict-rules phpdoc_advanced_phan_side_effect_free.php:22: Impure echo in pure function Conformance\Tests\PhpdocAdvancedPhanSideEffectFree\claimsSideEffectFree(). Recognition: spelling resolved Enforcement: 1/1 of the expected violations reported
psalm	6.20.9Psalm 6.20.9@f67170ac3c3b931f5088681e21d6c8babc601c08 next: 7.0.4	Not enforced	No diagnostics reported. Recognition: spelling resolved Enforcement: 0/1 of the expected violations reported
mago	1.59.0mago 1.59.0	Not enforced	No diagnostics reported. Recognition: spelling resolved Enforcement: 0/1 of the expected violations reported
mir	0.91.0mir 0.91.0	Not enforced	No diagnostics reported. Recognition: spelling resolved Enforcement: 0/1 of the expected violations reported
phpantom	0.11.1phpantom_lsp 0.11.1	Not enforced	No diagnostics reported. Recognition: spelling resolved Enforcement: 0/1 of the expected violations reported
intelephense	1.18.5intelephense 1.18.5	Not enforced	No diagnostics reported. Recognition: spelling resolved Enforcement: 0/1 of the expected violations reported
phpactor	2026.10.07.0Phpactor 2026.10.07.0	Not enforced	No diagnostics reported. Recognition: spelling resolved Enforcement: 0/1 of the expected violations reported
phpy	1.0.19490phpy 1.0.19490	Not enforced	No diagnostics reported. Recognition: spelling resolved Enforcement: 0/1 of the expected violations reported
qodana	262.11879.104PhpStorm 262.11879.104	Not enforced	No diagnostics reported. Recognition: spelling resolved Enforcement: 0/1 of the expected violations reported
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. Recognition: spelling resolved Enforcement: 0/1 of the expected violations reported
steins	0.1.8steins 0.1.8 (2026-09-21 revision 76306a9)	Not enforced	No diagnostics reported. Recognition: spelling resolved Enforcement: 0/1 of the expected violations reported
phpstan-strict	2.3.5PHPStan - PHP Static Analysis Tool 2.3.5	Enforced	phpdoc_advanced_phan_side_effect_free.php:22: Impure echo in pure function Conformance\Tests\PhpdocAdvancedPhanSideEffectFree\claimsSideEffectFree(). Recognition: spelling resolved Enforcement: 1/1 of the expected violations reported
psalm-next	7.0.4Psalm 7.0.4@fa5b1f6e665cb743838ffd865b8fc96207f9409f	Not enforced	No diagnostics reported. Recognition: spelling resolved Enforcement: 0/1 of the expected violations reported

Source

<?php

declare(strict_types=1);

namespace Conformance\Tests\PhpdocAdvancedPhanSideEffectFree;

/**
 * Cross-tool handling of `@phan-side-effect-free`.
 *
 * Phan's purity-adjacent claim on a function. Honouring it means reporting
 * side effects in the body (similar spirit to `@psalm-pure` / `@phpstan-pure`).
 *
 * References:
 * - Phan Annotating-Your-Source-Code: `@phan-side-effect-free`
 */

/**
 * @phan-side-effect-free
 */
function claimsSideEffectFree(int $value): int // T: @phan-side-effect-free
{
    echo 'side effect'; // E?: echo contradicts @phan-side-effect-free

    return $value + 1; // V
}

echo claimsSideEffectFree(1);