public function getSearchableKeys()
    {
        return array_values(array_map(function ($value, $key) {
            return (is_array($value) || is_numeric($key) === false) ? $key : $value;
        }, $this->searchable, array_keys($this->searchable)));
    }
public function getSearchableKeys()
    {
        return array_values(array_map(function ($value, $key) {
            return (is_array($value) || is_numeric($key) === false) ? $key : $value;
        }, $this->searchable, array_keys($this->searchable)));
    }
public function getSearchableKeys ( ) { return array_values ( array_map ( function ( $ value , $ key ) { return ( is_array ( $ value ) || is_numeric ( $ key ) === false ) ? $ key : $ value ; } , $ this -> searchable , array_keys ( $ this -> searchable ) ) ) ; }
Return searchable keys.

@return array
Return searchable keys .