PHP如何准确获取访问者的IP地址？

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phpfunction getip() { $ip=''; $ip=$_SERVER['REMOTE_ADDR']; if (isset($_SERVER['HTTP_CDN_SRC_IP'])) { $ip=$_SERVER['HTTP_CDN_SRC_IP']; } elseif (isset($_SERVER['HTTP_CLIENT_IP']) && preg_match('/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $_SERVER['HTTP_CLIENT_IP'])) { $ip=$_SERVER['HTTP_CLIENT_IP']; } return $ip;}

function getip() { static $ip = ''; $ip = $_SERVER['REMOTE_ADDR']; if(isset($_SERVER['HTTP_CDN_SRC_IP'])) { $ip = $_SERVER['HTTP_CDN_SRC_IP']; } elseif (isset($_SERVER['HTTP_CLIENT_IP']) && preg_match('/^([0-9]{1,3}\\.){3}[0-9]{1,3}$/', $_SERVER['HTTP_CLIENT_IP'])) { $ip = $_SERVER['HTTP_CLIENT_IP']; } elseif(isset($_SERVER['HTTP_X_FORWARDED_FOR']) AND preg_match_all('#\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}#s', $_SERVER['HTTP_X_FORWARDED_FOR'], $matches)) { foreach ($matches[0] AS $xip) { if (!preg_match('#^(10|172\\.16|192\\.168)\\.#', $xip)) { $ip = $xip; break; } } } return $ip; }