public function keys()
    {
        return array_map(
            function ($key) {
                $chunks = explode('_', $key);

                return array_pop($chunks);
            },
            array_keys($this->pagers)
        );
    }
public function keys()
    {
        return array_map(
            function ($key) {
                $chunks = explode('_', $key);

                return array_pop($chunks);
            },
            array_keys($this->pagers)
        );
    }
public function keys ( ) { return array_map ( function ( $ key ) { $ chunks = explode ( '_' , $ key ) ; return array_pop ( $ chunks ) ; } , array_keys ( $ this -> pagers ) ) ; }
Returns context ids array.

@return array
Returns context ids array .