onethink文章详情如何做上一篇和下一篇！

//上一篇文章
$prewhere = array();
$prewhere[‘id‘] = array(‘LT‘,$id);
$pre = M(‘document‘)->where($prewhere)->field(‘id‘)->limit(‘1‘)->order(‘id desc‘)->select();
$pre = intval($pre[‘0‘][‘id‘]);
//下一篇文章
$nextwhere = array();
$nextwhere[‘id‘] = array(‘GT‘,$id);
$next = M(‘document‘)->where($nextwhere)->field(‘id‘)->limit(‘1‘)->order(‘id asc‘)->select();
$next = intval($next[‘0‘][‘id‘]);