PHP获取客户端IP

function getIP(){if( isset($_SERVER) ){if( isset($_SERVER["HTTP_X_FORWARDED_FOR"]) ){$ip = $_SERVER["HTTP_X_FORWARDED_FOR"];} elseif ( isset($_SERVER["HTTP_CLIENT_IP"]) ) {$ip = $_SERVER["HTTP_CLIENT_IP"];} elseif ( isset($_SERVER["REMOTE_ADDR"]) ) {$ip = $_SERVER["REMOTE_ADDR"];} else {$ip = $_SERVER["SSH_CLIENT"];}} else {if( getenv("HTTP_X_FORWARDED_FOR") ){$ip = getenv("HTTP_X_FORWARDED_FOR");} elseif ( getenv("HTTP_CLIENT_IP") ) {$ip = getenv("HTTP_CLIENT_IP");} else {$ip = getenv("REMOTE_ADDR");} } return $ip;}