protected function removeExtraKeys()
    {
        foreach ($this->extraKeys as $offset => $value) {
            if ($this->data[$offset] === null) {
                unset($this->data[$offset]);
            }
        }
        $this->extraKeys = [];
    }
protected function removeExtraKeys()
    {
        foreach ($this->extraKeys as $offset => $value) {
            if ($this->data[$offset] === null) {
                unset($this->data[$offset]);
            }
        }
        $this->extraKeys = [];
    }
protected function removeExtraKeys ( ) { foreach ( $ this -> extraKeys as $ offset => $ value ) { if ( $ this -> data [ $ offset ] === null ) { unset ( $ this -> data [ $ offset ] ) ; } } $ this -> extraKeys = [ ] ; }
Removes extra keys in data
Removes extra keys in data