php递归求和
<?php
$num=3;
function sum($num){
static $tot;
if($num>=1){
$tot+=$num;
return sum(--$num);
}else{
return $tot;
}
}
echo sum($num);
?>
<?php
function SontoFather($i)
{
$database = pc_base::load_config('pcms_db');
$db=new tg_mysql;
$db->config($config=array(
"host"=>$database["default"]["hostname"],
"user"=>$database["default"]["username"],
"pass"=>$database["default"]["password"],
"database"=>$database["default"]["database"]));
$sql = "SELECT parent_id,tag,tagid FROM `tags` WHERE 1 AND modelid=1 AND `tagid`=".$i;
$result = $db->query($sql);
$row=$db->fetch_array($result);
if($row[0]!=0)
{
#echo "yes";
$i = $row[0];
return $this->SontoFather($i);
}else{
#echo $row[1];
//$j=$row[1];
#echo "no";
return $row[2];
}
}
echo SontoFather(1);
?>
数字库结构
id name parent_id
1 test 0
2 test2 1
3 test3 2
