Allow dynamic properties from PHPDoc

src/Psalm/Internal/Analyzer/Statements/Expression/Fetch/AtomicPropertyFetchAnalyzer.php

@@ -1197,7 +1197,8 @@ private static function handleNonExistentProperty(
         ?string $var_id,
         bool &$has_valid_fetch_type
     ): void {
-        if ($config->use_phpdoc_property_without_magic_or_parent
+        if (($config->use_phpdoc_property_without_magic_or_parent
+            || $class_storage->hasAttributeIncludingParents('AllowDynamicProperties', $codebase))
             && isset($class_storage->pseudo_property_get_types['$' . $prop_name])
         ) {
             $stmt_type = $class_storage->pseudo_property_get_types['$' . $prop_name];

src/Psalm/Storage/ClassLikeStorage.php

@@ -4,6 +4,7 @@
 
 use Psalm\Aliases;
 use Psalm\CodeLocation;
+use Psalm\Codebase;
 use Psalm\Config;
 use Psalm\Internal\Analyzer\ClassLikeAnalyzer;
 use Psalm\Internal\MethodIdentifier;
@@ -486,6 +487,24 @@ public function getAttributeStorages(): array
         return $this->attributes;
     }
 
+    public function hasAttributeIncludingParents(
+        string $fq_class_name,
+        Codebase $codebase
+    ): bool {
+        if ($this->hasAttribute($fq_class_name)) {
+            return true;
+        }
+
+        foreach ($this->parent_classes as $parent_class) {
+            $parent_class_storage = $codebase->classlike_storage_provider->get($parent_class);
+            if ($parent_class_storage->hasAttribute($fq_class_name)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
     /**
      * Get the template constraint types for the class.
      *
@@ -511,4 +530,15 @@ public function hasSealedMethods(Config $config): bool
     {
         return $this->sealed_methods ?? $config->seal_all_methods;
     }
+
+    private function hasAttribute(string $fq_class_name): bool
+    {
+        foreach ($this->attributes as $attribute) {
+            if ($fq_class_name === $attribute->fq_class_name) {
+                return true;
+            }
+        }
+
+        return false;
+    }
 }

tests/Internal/Analyzer/Statements/Expression/Fetch/AtomicPropertyFetchAnalyzerTest.php

@@ -0,0 +1,75 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Psalm\Tests\Internal\Analyzer\Statements\Expression\Fetch;
+
+use Psalm\Tests\TestCase;
+use Psalm\Tests\Traits\ValidCodeAnalysisTestTrait;
+
+final class AtomicPropertyFetchAnalyzerTest extends TestCase
+{
+    use ValidCodeAnalysisTestTrait;
+
+    public function providerValidCodeParse(): iterable
+    {
+        return [
+            'allowDynamicProperties' => [
+                'code' => '<?php
+                    /** @property-read string $foo */
+                    #[\AllowDynamicProperties]
+                    class A {
+                        public function __construct(string $key, string $value)
+                        {
+                            $this->$key = $value;
+                        }
+                    }
+
+                    echo (new A("foo", "bar"))->foo;
+                    ',
+                'assertions' => [],
+                'ignored_issues' => [],
+                'php_version' => '8.2',
+            ],
+            'allowDynamicProperties for child' => [
+                'code' => '<?php
+                    /** @property-read string $foo */
+                    #[\AllowDynamicProperties]
+                    class A {
+                        public function __construct(string $key, string $value)
+                        {
+                            $this->$key = $value;
+                        }
+                    }
+
+                    class B extends A {}
+
+                    echo (new B("foo", "bar"))->foo;
+                    ',
+                'assertions' => [],
+                'ignored_issues' => [],
+                'php_version' => '8.2',
+            ],
+            'allowDynamicProperties for grandchild' => [
+                'code' => '<?php
+                    /** @property-read string $foo */
+                    #[\AllowDynamicProperties]
+                    class A {
+                        public function __construct(string $key, string $value)
+                        {
+                            $this->$key = $value;
+                        }
+                    }
+
+                    class B extends A {}
+                    class C extends B {}
+
+                    echo (new C("foo", "bar"))->foo;
+                    ',
+                'assertions' => [],
+                'ignored_issues' => [],
+                'php_version' => '8.2',
+            ],
+        ];
+    }
+}