class.allowDynamicPropertiesReadonly

Code example

<?php declare(strict_types = 1);

#[\AllowDynamicProperties]
readonly class Foo
{
	public function __construct(
		public string $name,
	)
	{
	}
}

Why is it reported?

The #[\AllowDynamicProperties] attribute cannot be used with readonly classes. Readonly classes have all their properties implicitly declared as readonly, and dynamic properties are inherently incompatible with readonly semantics because dynamic properties cannot be declared as readonly. PHP will emit a fatal error at runtime.

In the example above, Foo is a readonly class with the #[\AllowDynamicProperties] attribute, which is not allowed.

How to fix it

Remove the #[\AllowDynamicProperties] attribute from the readonly class:

 <?php declare(strict_types = 1);

-#[\AllowDynamicProperties]
 readonly class Foo
 {
 	public function __construct(
 		public string $name,
 	)
 	{
 	}
 }

If you need dynamic properties, remove the readonly modifier from the class and declare specific properties as readonly individually instead:

 <?php declare(strict_types = 1);

 #[\AllowDynamicProperties]
-readonly class Foo
+class Foo
 {
 	public function __construct(
-		public string $name,
+		public readonly string $name,
 	)
 	{
 	}
 }