获取客户端IP的解决办法

1.针对Apache服务器

function getUserIp(){
	if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {
		$user_ip = getenv('HTTP_CLIENT_IP');
	} elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
		$user_ip = getenv('HTTP_X_FORWARDED_FOR');
	} elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
		$user_ip = getenv('REMOTE_ADDR');
	} elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {
		$user_ip = $_SERVER['REMOTE_ADDR'];
	}else{
		$user_ip = '0.0.0.0';
	}
	
	$user_ip = preg_replace("/^([\d\.]+).*/", "\\1", $user_ip);
	return $user_ip;
}

  2.IIS  getenv不支持IIS的isapi方式运行的php

  3.http://www.cnblogs.com/lmule/archive/2010/10/15/1852020.html