paramClosureThis.nonClosure

Code example

<?php declare(strict_types = 1);

class Foo
{
	/**
	 * @param-closure-this Foo $callback
	 */
	public function register(string $callback): void
	{
	}
}

Why is it reported?

The @param-closure-this PHPDoc tag is used on a parameter whose native type is not Closure. The @param-closure-this tag specifies the $this context inside a Closure, so it only makes sense for parameters typed as Closure. Other types (like string, callable, or array) do not bind a $this context in the same way.

How to fix it

Change the parameter type to Closure:

 class Foo
 {
 	/**
 	 * @param-closure-this Foo $callback
 	 */
-	public function register(string $callback): void
+	public function register(\Closure $callback): void
 	{
 	}
 }

Or remove the @param-closure-this tag if the parameter is not intended to be a Closure:

 class Foo
 {
-	/**
-	 * @param-closure-this Foo $callback
-	 */
 	public function register(string $callback): void
 	{
 	}
 }