获取在线ip

function getonlineip($format=0) {
	global $_SGLOBAL;

	if(empty($_SGLOBAL['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'];
		}
		preg_match("/[\d\.]{7,15}/", $onlineip, $onlineipmatches);
		$_SGLOBAL['onlineip'] = $onlineipmatches[0] ? $onlineipmatches[0] : 'unknown';
	}
	if($format) {
		$ips = explode('.', $_SGLOBAL['onlineip']);
		for($i=0;$i<3;$i++) {
			$ips[$i] = intval($ips[$i]);
		}
		return sprintf('%03d%03d%03d', $ips[0], $ips[1], $ips[2]);
	} else {
		return $_SGLOBAL['onlineip'];
	}
}