用户Ip地址和百度地图api接口获取用户地理位置（经纬度坐标，城市）

<?php
 
//获取用户ip(外网ip 服务器上可以获取用户外网Ip 本机ip地址只能获取127.0.0.1)

function getip(){

    if(!empty($_SERVER["HTTP_CLIENT_IP"])){

    $cip = $_SERVER["HTTP_CLIENT_IP"];

    }

    else if(!empty($_SERVER["HTTP_X_FORWARDED_FOR"])){

    $cip = $_SERVER["HTTP_X_FORWARDED_FOR"];

    }

    else if(!empty($_SERVER["REMOTE_ADDR"])){

    $cip = $_SERVER["REMOTE_ADDR"];

    }

    else{

    $cip = \'\';

    }

    preg_match("/[\d\.]{7,15}/", $cip, $cips);

    $cip = isset($cips[0]) ? $cips[0] : \'unknown\';

    unset($cips);

    return $cip;
}
 
$ip=getip();
 
//根据百度地图api得到用户Ip地理经纬度和城市
 
$url = "http://api.map.baidu.com/location/ip?ak=omi69HPHpl5luMtrjFzXn9df&ip=$ip&coor=bd09ll";

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $url);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

$output = curl_exec($ch);

if(curl_errno($ch))

{ echo \'CURL ERROR Code: \'.curl_errno($ch).\', reason: \'.curl_error($ch);}

curl_close($ch);

$info = json_decode($output, true);

if($info[\'status\'] == "0"){

    $lotx = $info[\'content\'][\'point\'][\'y\'];

    $loty = $info[\'content\'][\'point\'][\'x\'];

    $citytemp = $info[\'content\'][\'address_detail\'][\'city\'];

    $keywords = explode("市",$citytemp);

    $city = $keywords[0];
}

else{

    $lotx = "34.2597";

    $loty = "108.9471";

    $city = "西安";
}
 
var_dump($lotx);//x坐标  纬度

var_dump($loty);//y坐标  经度

var_dump($city);//用户Ip所在城市

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百度地图api新增功能有时间可以看看

http://developer.baidu.com/map/index.php?title=jspopular