PHP获取客户端的ip地址

服务端获取客服端的ip地址，PHP实现获取客服端的ip，在此记录下。

<?php 
function getIp() { 
  static $realip = NULL; 
  if (isset($_SERVER)) { 
    if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])){ 
      $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']); 
      foreach ($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; 
  } 
}

//测试函数 
$ip = getIp(); 
print $ip;

测试结果