Automatically load province information

Introduce jquery file:

##<script src="./jquery-1.11.0.js" type="text/javascript "></script>

#Add code in region.html:

<script type="text/javascript">
    $(document).ready(function() {
        //  加载所有的省份
        $.ajax({
            type: "get",
            url: "region_action.php", // type=1表示查询省份
            data: {"parent_id": "1", "type": "1"},
            dataType: "json",
            success: function(data) {
                $("#provinces").html("<option value=''>请选择省份</option>");
                $.each(data, function(i, item) {
                    // alert(item.region_id);
                    $("#provinces").append("<option value='" + item.region_id + "'>" + item.region_name + "</option>");
                });
            }
        });
</script>

##The code is as follows:

<?php
header("Content-Type:text/html;charset=utf-8");
include './mysqli.php';
$type = isset($_GET["type"]) ? $_GET["type"] : "";
$parent_id = isset($_GET["parent_id"]) ? $_GET["parent_id"] : "";
// 链接数据库
if ($type == "" || $parent_id == "") {
    exit(json_encode(array("flag" => false, "msg" => "查询类型错误")));
} else {  
    // 链接数据库
    $sql="select *from global_region where parent_id=$parent_id AND region_type=$type";
    $result=$mysqli->query($sql);
    if($result->num_rows>0)
    {
        $arr=[];
        while ($row=$result->fetch_assoc())
        {
            $arr[$row["region_id"]]['region_id']=$row["region_id"];//$arr[1]["title"]=$row["title"]
            $arr[$row["region_id"]]['region_name']=$row["region_name"];//$arr[1]["content"]=$arr["content"]
        }
    }
    $provinces_json = json_encode($arr);//数组转json
    exit($provinces_json);
}
?>