php实现根据IP地址获取其所在省市的方法

function GetIpLookup($ip = ){  
  if(empty($ip)){  
    return 请输入IP地址; 
  }  
  $res = @file_get_contents(http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js&ip= . $ip);  
  if(empty($res)){ return false; }  
  $jsonMatches = array();  
  preg_match(#\{.+?\}#, $res, $jsonMatches);  
  if(!isset($jsonMatches[0])){ return false; }  
  $json = json_decode($jsonMatches[0], true);  
  if(isset($json[ret]) && $json[ret] == 1){  
    $json[ip] = $ip;  
    unset($json[ret]);  
  }else{  
    return false;  
  }  
  return $json;  
} 
$ipInfos = GetIpLookup(123.125.114.144); //baidu.com IP地址  
var_dump($ipInfos); 

function getIpAddress(){  
  $ipContent  = file_get_contents("http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js");  
  $jsonData = explode("=",$ipContent);   
  $jsonAddress = substr($jsonData[1], 0, -1);  
  return $jsonAddress;  
}  
$ip_info=json_decode(getIpAddress());