public function removeIndex($index)
    {
        if ($this->hasIndex($index)) {
            unset($this->_items[$index]);
            $this->_iterator = null;
            return true;
        }
        return false;
    }
public function removeIndex($index)
    {
        if ($this->hasIndex($index)) {
            unset($this->_items[$index]);
            $this->_iterator = null;
            return true;
        }
        return false;
    }
public function removeIndex ( $ index ) { if ( $ this -> hasIndex ( $ index ) ) { unset ( $ this -> _items [ $ index ] ) ; $ this -> _iterator = null ; return true ; } return false ; }
remove element with specified position from list

@param    int        $index      element index
@return   bool
remove element with specified position from list