pro_city.php 初始页面：
省市二级联动
省市二级联动
show.php
header("content-type:text/html;charset=utf-8");
$province_id = $_GET['id'];
if($province_id=='10000000' || $province_id=='11000000' || $province_id=='18000000' || $province_id=='31000000')
{
//直辖市
$sql = "select id,cname from areas where id='{$province_id}'";
}
else
{
$sql = "select id,cname from areas where parentid={$province_id}";
}
$conn = mysql_connect("localhost","root","root"); //连接数据库
mysql_query("set names utf8");
mysql_select_db("bbs");
$rs = mysql_query($sql);
$show = "
";
if($province_id=='-1') //选中”请选择省份“时，城市列表显示"请选择城市"
{
$show="
";
}
echo $show; //返回字符串显示到页面
?>
