php获取本机外网/公网IP的代码_php技巧

function get_onlineip() { 
$ch = curl_init('http://www.ip138.com/ip2city.asp'); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
$a = curl_exec($ch); 
preg_match('/\[(.*)\]/', $a, $ip); 
return $ip[1]; 
} 
 


方法二：$_SERVER['HTTP_X_FORWARDED_FOR']来获取相应的地址 
 代码如下:

function get_onlineip() { 
$onlineip = ''; 
if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) { 
$onlineip = getenv('HTTP_CLIENT_IP'); 
} elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) { 
$onlineip = getenv('HTTP_X_FORWARDED_FOR'); 
} elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) { 
$onlineip = getenv('REMOTE_ADDR'); 
} elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) { 
$onlineip = $_SERVER['REMOTE_ADDR']; 
} 
return $onlineip; 
}