官方文档：http://lbsyun.baidu.com/index.php?title=webapi/ip-api
$ipAddress = '127.0.0.1'; // ip 地址
$coordinateType = null; // 坐标类型, 不传默认百度墨卡托坐标，bd09ll：百度经纬度坐标，gcj02：国测局02坐标
$webApi->ip_locate->get($ipAddress, $coordinateType);
返回结果示例:
{
"address":"CN|广东|深圳|None|CHINANET|0|0",
"content":{
"address_detail":{
"province":"广东省",
"city":"深圳市",
"district":"",
"street":"",
"street_number":"",
"city_code":340
},
"address":"广东省深圳市",
"point":{
"y":"2561692.45",
"x":"12681452.34"
}
},
"status":0
}