php 擷取用戶端的ip地址程式碼

最簡單的做法

代碼如下	複製代碼
function getRealIpAddr() {   if (!emptyempty($_SERVER['HTTP_CLIENT_IP']))   {     $ip=$_SERVER['HTTP_CLIENT_IP'];   }   elseif (!emptyempty($_SERVER['HTTP_X_FORWARDED_FOR']))   //to check ip is pass from proxy   {     $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];   }   else   {     $ip=$_SERVER['REMOTE_ADDR'];   }   return $ip; }

這個我自己寫的

 

代碼如下

複製代碼

<?php 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'];  } echo $onlineip; ?>

但感覺不怎麼樣，後來百度找到了一個

執行個體

代碼如下

複製代碼

function real_ip() {  static $realip = NULL;  if ($realip !== NULL)  {   return $realip;  }  if (isset($_SERVER)) {   if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {    $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);    /* 取X-Forwarded-For中第一個非unknown的有效IP字串 */    foreach ($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);  $realip = !empty($onlineip[0]) ? $onlineip[0] : '0.0.0.0';  return $realip; }