PHP教程：PHP实现多级分类生成树的方法示例

PHP实战
$sql ="XXXXXXXXXX";   //sql语句
$res = $db->Select($sql);  //执行sql
$list=array();
treeList(treeGet($res),$list);  /生成树
print_r($res);  //打印出来看看!

PHP实战
┣推荐新闻啊
┃┣国际新闻
┃┣dfffffg
┃┣ttttttt
┃┃┗yyyyy

PHP实战
/**
* 选择SQL涵数
*
* @access public
* @param Array  $field  字段信息,支持涵数
* @param Array  $table  数据库表
* @param Array  $where  条件
* @return SQL SQL语句
*/
function treeGet($data)
{
  $tmptree=null;
  $tree=$data;
  return treeAddNodeToTree($tmptree,treegetbyuid($tree,0,@$field),$tree);
}
/**
*插入SQL涵数
*
* @access public
* @param Array  $fieldResult  字段信息,支持涵数
* @param Array  $table  数据库表
* @return SQL SQL语句
*/
function treeAddNodeToTree($Node,$miniTree,&$source)
{
  if(is_array($miniTree)) {
    foreach($miniTree as $k=>$v)
    {
      if(!count($miniTree[$k]['child']=treeAddNodeToTree($miniTree[$k],treegetbyuid($source,@$v['id']),$source)))
      {
        unset($miniTree[$k]['child']);
        $miniTree[$k]['leaf']=true; //设置叶结点
      }
    }
    return $Node['child']=$miniTree;
  }
}
function treegetbyuid(&$stree,$uid)
{
  $dtree=array();
  if(is_array($stree)){
    foreach($stree as $k=>$v)
    {
      if($v['fid']==$uid)
      {
        $mytmp=array();
        $mytmp=$v;
        unset($stree[$k]);
        array_push($dtree,$mytmp);
        $mytmp=null;
      }
    }
  }
  return $dtree;
}
/**
*更新SQL涵数
*
* @access public
* @param Array  $fieldResult  字段信息,支持涵数
* @param Array  $table  数据库表
* @param Array  $where  条件
* @return SQL SQL语句
*/
function treeMakeDeep($deep)
{
  $returnValue="";
  for (;$deep;$deep--)
  {
    $returnValue.="┃";
  }
  return $returnValue."┣";
}
function treeList($treeData,&$List)
{
  static $deep=0;
  if(is_array($treeData))
  {
    foreach($treeData as $k=>$v)
    {
      $v['deepValue']=treeMakeDeep($deep);
      $v['deep']=$deep;
      $t=$v;
      unset($t['child']);
      array_push($List,$t);
      if($v['child'])
      {
        ++$deep;
        $optionsNode.=treeList($v['child'],$List);
        $deep--;
      }
    }
    if($lastV=array_pop($List))
    {
      $lastV['deepValue']=str_replace('┣','┗',$lastV['deepValue']);
      array_push($List,$lastV);
    }
  }
}
function treeSelect($tree,$id,$options="child")
{
  switch(strtolower($options))
  {
    case"child":
    $tmpTree=array();
    $deep=-1;
    foreach($tree as $k=>$v)
    {
      if($id==$v['id'])
      {
        array_push($tmpTree,$v);
        $deep=$v['deep'];
      } elseif($deep!=-1)
      {
        if($v['deep']<=$deep)
        {
          break;
        } else
        {
          array_push($tmpTree,$v);
        }
      }
    }
    break;
    case "remove":
    default:
    $tmpTree=array();
    $deep=-1;
    foreach($tree as $k=>$v)
    {
      if($id==$v['id'])
      {
        $deep=$v['deep'];
        continue;
      } elseif($deep!=-1)
      {
        if($v['deep']<=$deep)
        {
          array_push($tmpTree,$v);
          $deep=-1;
        }
        continue;
      }
      array_push($tmpTree,$v);
    }
  }
  return $tmpTree;
}