帖子回复――无限级分类
若是QQ空间那种，这里无需再使用无限级分类。
而是帖子之下的评论回复使用字段标记分清从属后按时间排序就行
//根据回复评论表，查询出回复人和被回复人信息
select acrr.id,comment_id,content,time,acrr.account_id,type,mi.name as mename,mi.image as mimg, do.name as doname,do.image as dimg,replied_account_id,rtype,(select name from ll_member_info where account_id=replied_account_id) as rmename, (select name from ll_doctor_info where account_id=replied_account_id) as rdoname, (select image from ll_member_info where account_id=replied_account_id) as rmimg, (select image from ll_doctor_info where account_id=replied_account_id) as rdimg from ll_article_comment_reply_record as acrr left join ll_member_info as mi on acrr.account_id=mi.account_id left join ll_doctor_info as do on acrr.account_id=do.account_id where article_id=$article_id AND comment_id=$cid order by time asc
无限级分类：一个分类型可以有无限个分类
常见的无限分类实现
商品分类，子类导航，贴吧回帖
//=====1.递归方式实现无限级分类======
原理：每个分类都需记录它的父级id，当为顶级分类时，父级id为0.每个分类都可通过父级id一层层查明它所在父级，以便知道它所属分类，层级深度为几。
递归――自己调用自身（一定要有判断）？
储存结果的变量迭代方法
function getList(&$i=1){ echo $i.'<br/>'; $i++; if($i<20){ getList($i); } }
getList(); |
$i=1; function getList(){ global $i; echo $i.'<br/>'; $i++; if($i<20){ getList($i); } }
getList(); |
function getList(){ static $i=1; echo $i.'<br/>'; $i++; if($i<20){ getList($i); } }
getList(); |
总结：
self::getList($row['id'],$result,$spac);不断递归pid
$sql='select * from imooc where pid='.$pid;不断按需要调整条件查询
function getList($pid=0,&$result=array(),$spac=0) $result[]=$row;不断迭代
当使用迭代去除所有数据时，是怎样区分ta分级的。
getList($pid=0,&$result=array(),$spac=0)
用这个表示区分层数，每次调用都是new出新栈独立运算
//=====2.全路径无限分类：以一个字段把它所有父级ID按顺序记录下来=====
总结：
$sql="select id,catename,path,concat(path,',',id) as fullpath from imooc order by fullpath asc";
他在order by的时候就已经将序列搞好了
区分深度
$deep=count(explode(',', trim($row['fullpath'],',')));
///////////////////////////////////////////////////////////////////无限级分类_代码展示////////////////////////////////////////////////////////////////////////////
<?
/*
* Author:Abo
* Date:2015/7/27
*/
/*
变成下拉列表
从pid=0递归下去
*/
class toList{
public static $mysqli;
function conn(){
$mysqli=new mysqli('localhost','root','','test');
$mysqli->query('set names utf8');
if(!$mysqli) die("连接数据库失败".$mysqli->connect_error());
return $mysqli;
}
function getList($pid=0,&$result=array(),$spac=0){
$spac=$spac+4;
$mysqli=self::conn();
$sql='select * from imooc where pid='.$pid;
$res=$mysqli->query($sql);
while ($row=$res->fetch_assoc()) {
$row['catename']=str_repeat(' ', $spac).'|--'.$row['catename'];
$result[]=$row;
self::getList($row['id'],$result,$spac); //递归
}
return $result;
if($mysqli!=null) $mysqli->close();
}
}
/*
按要求封装数据，变成下拉列表
*/
function displayCate($pid = 0, $selected = 0) {
$ts = new toList ();
$ts->conn ();
$rs = $ts->getList ();
$temp=null;
$str="<select name='cate'>";
foreach ( $rs as $val ) {
$temp=null;
if($val['id']==$selected){
echo $val['id'];
$temp="selected='selected'";
}
$str.="<option $temp >".$val ['catename'].'</option>';
}
$str.='</select>';
return $str;
}
header("Content-Type: text/html;charset=utf8");
echo displayCate(0,2);
/*
变成导航栏
从pid=10递归上来再倒序
*/
class toList{
public $host='localhost';
public $username='root';
public $password='';
public $db='test';
function conn(){
$mysqli=new mysqli($this->host,$this->username,$this->password,$this->db);
$mysqli->query('set names utf8');
if(!$mysqli) die('数据库连接失败'.$mysqli->connect_error);
return $mysqli;
}
function getList($id,&$result=array()){
$sql='select * from imooc where id='.$id;
$mysqli=self::conn();
$res=$mysqli->query($sql);
if($row=$res->fetch_assoc()){
$result[]=$row;
self::getList($row['pid'],$result);
}
return $result;
}
}
$ts=new toList();
$rs=$ts->getList(10);
/*
按要求封装变成地址导航
*/
echo krsort($rs);
header("Content-Type: text/html;charset=utf8");
echo '<pre>';
print_r($rs);
//===============================全路径无限分类==================================
/*
下拉列表
*/
class toList{
public $host='localhost';
public $username='root';
public $password='';
public $db='test';
function conn(){
$mysqli=new mysqli($this->host,$this->username,$this->password,$this->db);
$mysqli->query('set names utf8');
if(!$mysqli) die('数据库连接失败'.$mysqli->connect_error);
return $mysqli;
}
function getList(){
$sql="select id,catename,path,concat(path,',',id) as fullpath from imooc order by fullpath asc";
$mysqli=self::conn();
$res=$mysqli->query($sql);
$result=array();
while($row=$res->fetch_assoc()){
$deep=count(explode(',', trim($row['fullpath'],',')));
$row['catename']=str_repeat(' ', $deep).'|--'.$row['catename'];
$result[]=$row;
// self::getList($row['pid'],$result);
}
return $result;
}
}
$ts=new toList();
$rs=$ts->getList();
header("Content-Type: text/html;charset=utf8");
$str="<select name='cate'>";
foreach ($rs as $val){
$str.='<option>'.$val['catename'].'<option>';
}
$str.="</select>";
echo $str;
class toList{
public $host='localhost';
public $username='root';
public $password='';
public $db='test';
function conn(){
$mysqli=new mysqli($this->host,$this->username,$this->password,$this->db);
$mysqli->query('set names utf8');
if(!$mysqli) die('数据库连接失败'.$mysqli->connect_error);
return $mysqli;
}
function getList($cateid){
$sql="select * ,concat(path,',',id) fullpath from imooc where id= $cateid";
$mysqli=self::conn();
$res=$mysqli->query($sql);
$row=$res->fetch_assoc();
$ids = $row['fullpath'];
$sql="select * from imooc where id in ($ids) order by id asc";
$res=$mysqli->query($sql);
$result=array();
while($row=$res->fetch_assoc()){
$deep=count(explode(',', trim($row['fullpath'],',')));
$row['catename']=str_repeat(' ', $deep).'|--'.$row['catename'];
$result[]=$row;
// self::getList($row['pid'],$result);
}
return $result;
}
}
$ts=new toList();
$rs=$ts->getList(4);
echo '<pre>';
print_r($rs);
header("Content-Type: text/html;charset=utf8");
// $str="<select name='cate'>";
/*
按要求封装变成地址导航
*/
foreach ($rs as $val){
echo "<a href=''>".$val['catename'].
"</a>>";
}