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Typed property reads before initialization

Group: Properties · Category: language · File: properties_uninitialized_read.php

References: - PHP typed properties - python-typing attribute initialization inspiration

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

No diagnostics reported.

phpstan 2.2.8PHPStan - PHP Static Analysis Tool 2.2.8 Pass

No diagnostics reported.

psalm 6.16.1Psalm 6.16.1@f1f5de594dc76faf8784e02d3dc4716c91c6f6ac
next: 7.0.0-beta19
Pass
properties_uninitialized_read.php:17: Conformance\Tests\PropertiesUninitializedRead\User has an uninitialized property Conformance\Tests\PropertiesUninitializedRead\User::$name, but no constructor [MissingConstructor]
mago 1.46.0mago 1.46.0 Pass

No diagnostics reported.

mir 0.70.1mir 0.70.1 Pass

No diagnostics reported.

phpantom 0.9.0phpantom_lsp 0.9.0 Pass

No diagnostics reported.

intelephense 1.18.5intelephense 1.18.5 Pass

No diagnostics reported.

phpy 0.2.0phpy 0.2.0 Pass

No diagnostics reported.

qodana 262.8665.325Qodana 262.8665.325 Fail
properties_uninitialized_read.php:21: Typed property 'name' might be uninitialized [PhpTypedPropertyMightBeUninitializedInspection]
Expectation diff
Line 21: Unexpected errors ["Typed property 'name' might be uninitialized [PhpTypedPropertyMightBeUninitializedInspection]"]
noverify 0.5.5NoVerify, version 0.5.5: built on: 2025.04.22 14:36:46 OS: r-kuchinskas arm64 Commit: 4774b82f8adc53fbef38f95e97af4b953b4d1529 Pass

No diagnostics reported.

steins 0.1.5steins 0.1.5 (2026-08-12 revision 39b4cc1) Pass

No diagnostics reported.

phpstan-strict 2.2.8PHPStan - PHP Static Analysis Tool 2.2.8 Pass

No diagnostics reported.

psalm-next 7.0.0-beta19Psalm 7.0.0-beta19@7e751c06a756fa64dc4c759c09fe4a173afcb433 Pass
properties_uninitialized_read.php:17: Conformance\Tests\PropertiesUninitializedRead\User has an uninitialized property Conformance\Tests\PropertiesUninitializedRead\User::$name, but no constructor [MissingConstructor]

Source

<?php

declare(strict_types=1);

namespace Conformance\Tests\PropertiesUninitializedRead;

/**
 * Typed property reads before initialization.
 *
 * References:
 * - PHP typed properties
 * - python-typing attribute initialization inspiration
 */

final class User
{
    public string $name; // E<psalm>: typed property is declared without guaranteed initialization
}

$user = new User();
echo $user->name;