PHP中如何獲取用戶IP地址

2020-03-22 18:54:01

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來源：轉載

供稿：網友

本文給大家主要分享的是在PHP中如何獲取用戶IP地址、PHP根據IP判斷用戶所在城市以及PHP根據IP實現城市切換或跳轉的問題。

我們先來看下個人常用的代碼

PHP

<?phpinclude_once('./qqwry.php');$QQWry=new QQWry;  function get_real_ip(){$ip=false;if(!empty($_SERVER["HTTP_CLIENT_IP"])){$ip = $_SERVER["HTTP_CLIENT_IP"];}if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {$ips = explode (", ", $_SERVER['HTTP_X_FORWARDED_FOR']);if ($ip) { array_unshift($ips, $ip); $ip = FALSE; }for ($i = 0; $i < count($ips); $i++) {if (!eregi ("^(10|172/.16|192/.168)/.", $ips[$i])) {$ip = $ips[$i];break;}}}return $ip;} function is_ip($str) {  $ip = explode(".", $str);  if (count($ip)<4 || count($ip)>4) return 0;  foreach($ip as $ip_addr) {    if ( !is_numeric($ip_addr) ) return 0;    if ( $ip_addr<0 || $ip_addr>255 ) return 0;  }  return 1;}  $ip=$_SERVER['REMOTE_ADDR']; $ifErr=$QQWry->QQWry($ip); $city = $QQWry->Country.$QQWry->Local; //echo $city;*/  if (strpos($city,'玄武區')!==false){  $city = "玄武區";}else if(strpos($city,'仙林')!==false){  $city = "仙林";}else if(strpos($city,'秦淮區')!==false){  $city = "秦淮區";}else if(strpos($city,'江寧')!==false){  $city = "江寧";}else if(strpos($city,'鼓樓')!==false){  $city = "鼓樓";}else{  $city = "棲霞";}if (isset($_GET['chengshi'])) { //ê×?è?ì2aê?·???μ?á? GET ′?μYμ?êy?Y  setcookie("cookie_city",$_GET['chengshi'],time()+3600*24);$city = $_GET['chengshi']; } else if (isset($_COOKIE["cookie_city"])) { //?ì2aê?·?′??úê?3?html' target='_blank'>Cookie  $city = $_COOKIE["cookie_city"]; //??ê?Cookie±￡′?μ?êy?Y } else {  setcookie("cookie_city",$city,time()+3600*24); //′?3?ê??ˉ′?±?á? $_COOKIE["cookie_city"] = $city;} ?>

HTML

<!DOCTYPE html><html lang="zh-cn"><head><meta charset="utf-8"/><LINK href="css/css.css" type=text/css rel=stylesheet><SCRIPT src="js/jquery-1.4.2.min.js" type=text/javascript></SCRIPT><title>城市切換</title></head><BODY><p class=selCity id=allCity style="DISPLAY: none"><p class=area><TABLE> <TBODY> <TR>  <TD><A class=cur href="show.html">玄武區</A></TD>  <TD><A href="show1.html">仙林</A></TD>  <TD><A href="show2.html">秦淮區</A></TD>  <TD><A href="show3.html">鼓樓</A></TD>  <TD><A href="show4.html">江寧</A></TD>  <TD><A href="show5.html">棲霞區</A></TD> </TR> </TBODY></TABLE><p class=none><A id=foldin href="javascript:;">全部</A></p></p></p><p class=header>  <p class=area>    <p class=r>      <p class="topCtiy clear">        <UL>                 <LI class=i1><A href="index.php">全部小區</A></LI>                  <LI class=i1>         <?php          echo $city;          ?>         </LI>         <LI class=i2 id=changeCity>切換城市</LI>        </UL>      </p>    </p>  </p></p><SCRIPT type=text/javascript>jQuery(function(){  $("#changeCity").click(function(a){    $("#allCity").slideDown(300);    a.stopPropagation();    $(this).blur();  });  $("#allCity").click(function(a){    a.stopPropagation()  });  $(document).click(function(a){    a.button!=2 && $("#allCity").slideUp(300)  });  $("#foldin").click(function(){    $("#allCity").slideUp(300)  });});</SCRIPT></body></html>

另外附上網友的實現方法：

使用方法：解壓后QQWry.Dat就是我們想要IP地址數據庫，我們新建一個ipcity文件夾，將數據庫放在下面。QQ IP數據庫使用非常方便，數據也很齊全，你可以及時關注官方更新以保持數據最新，強力推薦一下：）

接下來，我們在上面的ipcity目錄下新建一個ipaddress.php文件，直接復制以下代碼進去即可，重要的地方也作了相應注釋。B段：

<?/*函數名稱：ipCity參數說明：$userip——用戶IP地址函數功能：PHP通過IP地址判斷用戶所在城市author:leecontact:xpsem2010@gmail.com*/function ipCity($userip) {  //IP數據庫路徑，這里用的是QQ IP數據庫 20110405 純真版  $dat_path = 'QQWry.dat';  //判斷IP地址是否有效  if(!ereg("^([0-9]{1,3}.){3}[0-9]{1,3}$", $userip)){    return 'IP Address Invalid';  }  //打開IP數據庫  if(!$fd = @fopen($dat_path, 'rb')){    return 'IP data file not exists or access denied';  }  //explode函數分解IP地址，運算得出整數形結果  $userip = explode('.', $userip);  $useripNum = $userip[0] * 16777216 + $userip[1] * 65536 + $userip[2] * 256 + $userip[3];  //獲取IP地址索引開始和結束位置  $DataBegin = fread($fd, 4);  $DataEnd = fread($fd, 4);  $useripbegin = implode('', unpack('L', $DataBegin));  if($useripbegin < 0) $useripbegin += pow(2, 32);  $useripend = implode('', unpack('L', $DataEnd));  if($useripend < 0) $useripend += pow(2, 32);  $useripAllNum = ($useripend - $useripbegin) / 7 + 1;  $BeginNum = 0;  $EndNum = $useripAllNum;  //使用二分查找法從索引記錄中搜索匹配的IP地址記錄  while($userip1num>$useripNum || $userip2num<$useripNum) {    $Middle= intval(($EndNum + $BeginNum) / 2);    //偏移指針到索引位置讀取4個字節    fseek($fd, $useripbegin + 7 * $Middle);    $useripData1 = fread($fd, 4);    if(strlen($useripData1) < 4) {      fclose($fd);      return 'File Error';    }    //提取出來的數據轉換成長整形，如果數據是負數則加上2的32次冪    $userip1num = implode('', unpack('L', $useripData1));    if($userip1num < 0) $userip1num += pow(2, 32);    //提取的長整型數大于我們IP地址則修改結束位置進行下一次循環    if($userip1num > $useripNum) {      $EndNum = $Middle;      continue;    }    //取完上一個索引后取下一個索引    $DataSeek = fread($fd, 3);    if(strlen($DataSeek) < 3) {      fclose($fd);      return 'File Error';    }    $DataSeek = implode('', unpack('L', $DataSeek.chr(0)));    fseek($fd, $DataSeek);    $useripData2 = fread($fd, 4);    if(strlen($useripData2) < 4) {      fclose($fd);      return 'File Error';    }    $userip2num = implode('', unpack('L', $useripData2));    if($userip2num < 0) $userip2num += pow(2, 32);    //找不到IP地址對應城市    if($userip2num < $useripNum) {      if($Middle == $BeginNum) {        fclose($fd);        return 'No Data';      }      $BeginNum = $Middle;    }  }  $useripFlag = fread($fd, 1);  if($useripFlag == chr(1)) {    $useripSeek = fread($fd, 3);    if(strlen($useripSeek) < 3) {      fclose($fd);      return 'System Error';    }    $useripSeek = implode('', unpack('L', $useripSeek.chr(0)));    fseek($fd, $useripSeek);    $useripFlag = fread($fd, 1);  }  if($useripFlag == chr(2)) {    $AddrSeek = fread($fd, 3);    if(strlen($AddrSeek) < 3) {      fclose($fd);      return 'System Error';    }    $useripFlag = fread($fd, 1);    if($useripFlag == chr(2)) {      $AddrSeek2 = fread($fd, 3);      if(strlen($AddrSeek2) < 3) {        fclose($fd);        return 'System Error';      }      $AddrSeek2 = implode('', unpack('L', $AddrSeek2.chr(0)));      fseek($fd, $AddrSeek2);    } else {      fseek($fd, -1, SEEK_CUR);    }    while(($char = fread($fd, 1)) != chr(0))      $useripAddr2 .= $char;    $AddrSeek = implode('', unpack('L', $AddrSeek.chr(0)));    fseek($fd, $AddrSeek);    while(($char = fread($fd, 1)) != chr(0))      $useripAddr1 .= $char;  } else {    fseek($fd, -1, SEEK_CUR);    while(($char = fread($fd, 1)) != chr(0))      $useripAddr1 .= $char;    $useripFlag = fread($fd, 1);    if($useripFlag == chr(2)) {      $AddrSeek2 = fread($fd, 3);      if(strlen($AddrSeek2) < 3) {        fclose($fd);        return 'System Error';      }      $AddrSeek2 = implode('', unpack('L', $AddrSeek2.chr(0)));      fseek($fd, $AddrSeek2);    } else {      fseek($fd, -1, SEEK_CUR);    }    while(($char = fread($fd, 1)) != chr(0)){      $useripAddr2 .= $char;    }  }  fclose($fd);  //返回IP地址對應的城市結果  if(preg_match('/http/i', $useripAddr2)) {    $useripAddr2 = '';  }  $useripaddr = "$useripAddr1 $useripAddr2";  $useripaddr = preg_replace('/CZ88.Net/is', '', $useripaddr);  $useripaddr = preg_replace('/^s*/is', '', $useripaddr);  $useripaddr = preg_replace('/s*$/is', '', $useripaddr);  if(preg_match('/http/i', $useripaddr) || $useripaddr == '') {    $useripaddr = 'No Data';  }  return $useripaddr;}?>

PHP根據IP地址實現城市切換或跳轉

到這里，其實問題已經很簡單了，用簡單的js就通通搞定。C段如下：

//根據IP地址跳轉指定頁面js取得城市var city='<?echo ipCity($xp_UserIp);?>';//根據IP地址所有城市跳轉到指定頁面if(city.indexOf("上海市")>=0){    window.location.href="http://shanghai.demo.com/";}

將開頭的A段代碼和上面的C段代碼分別放在B段代碼的頭和尾，然后我們在需要跳轉的頁面加入以下代碼：

刷新頁面，是不是達到預想的效果了呢？

總結：以上就是本篇文的全部內容，希望能對大家的學習有所幫助。