assign.propertyReadOnly

Code example

<?php declare(strict_types = 1);

/**
 * @property-read int $readOnlyProperty
 */
class Foo
{
	public function __get(string $name): int
	{
		return 0;
	}

	public function doFoo(): void
	{
		$this->readOnlyProperty = 1;
	}
}

Why is it reported?

A value is being assigned to a property that is declared as read-only via a @property-read PHPDoc tag. Such a property is intended only for reading — there is no corresponding @property-write or @property tag that would allow writes.

In the example above, $readOnlyProperty is declared with @property-read, so assigning to it inside the class is not allowed.

How to fix it

Remove the assignment, or if writes are needed, change the PHPDoc tag to @property to allow both reading and writing:

-/**
- * @property-read int $readOnlyProperty
- */
+/**
+ * @property int $readOnlyProperty
+ */
 class Foo
 {