public function scPrev()
    {
        $mValue = $this->prev();

        return (false === $mValue and false === $this->valid()) ? self::NOT_SET_FLAG : $mValue;
    }
public function scPrev()
    {
        $mValue = $this->prev();

        return (false === $mValue and false === $this->valid()) ? self::NOT_SET_FLAG : $mValue;
    }
public function scPrev ( ) { $ mValue = $ this -> prev ( ) ; return ( false === $ mValue and false === $ this -> valid ( ) ) ? self :: NOT_SET_FLAG : $ mValue ; }
rewind the pointer for one position

@return mixed|false
rewind the pointer for one position