首页 >
PHP > PHP获得客户端真实IP地址
- /**
- * 获得用户的真实IP地址
- *
- * @access public
- * @return string
- */
- function real_ip()
- {
- static $realip = NULL;
- if ($realip !== NULL)
- {
- return $realip;
- }
- if (isset($_SERVER))
- {
- if (isset($_SERVER[‘HTTP_X_FORWARDED_FOR’]))
- {
- $arr = explode(‘,’, $_SERVER[‘HTTP_X_FORWARDED_FOR’]);
- /* 取X-Forwarded-For中第一个非unknown的有效IP字符串 */
- foreach ($arr AS $ip)
- {
- $ip = trim($ip);
- if ($ip != ‘unknown’)
- {
- $realip = $ip;
- break;
- }
- }
- }
- elseif (isset($_SERVER[‘HTTP_CLIENT_IP’]))
- {
- $realip = $_SERVER[‘HTTP_CLIENT_IP’];
- }
- else
- {
- if (isset($_SERVER[‘REMOTE_ADDR’]))
- {
- $realip = $_SERVER[‘REMOTE_ADDR’];
- }
- else
- {
- $realip = ‘0.0.0.0’;
- }
- }
- }
- else
- {
- if (getenv(‘HTTP_X_FORWARDED_FOR’))
- {
- $realip = getenv(‘HTTP_X_FORWARDED_FOR’);
- }
- elseif (getenv(‘HTTP_CLIENT_IP’))
- {
- $realip = getenv(‘HTTP_CLIENT_IP’);
- }
- else
- {
- $realip = getenv(‘REMOTE_ADDR’);
- }
- }
- preg_match(“/[\d\.]{7,15}/”, $realip, $onlineip);
- $realip = !emptyempty($onlineip[0]) ? $onlineip[0] : ‘0.0.0.0’;
- return $realip;
- }