class MyClass
{


    private $mything = ['gaga'];
    /** @test */
    public function mytest(){
        $rv = array_map(static function($record ) { return $this->mything;}, ['a', 'b']);
    }

class MyClass
{
    private $mything = ['gaga'];
public function mytest(){
   $rv = array_map(static fn($record ) => $this->mything, ['a', 'b']);
}