How to get user IP address in PHP-PHP Tutorial-php.cn

This article mainly shares with you how to obtain the user's IP address in PHP, PHP determines the city where the user is located based on the IP, and PHP implements city switching or jump based on the IP.

Let’s first look at the codes that are commonly used by individuals

PHP

<?php
include_once(&#39;./qqwry.php&#39;);
$QQWry=new QQWry; 
 
function get_real_ip(){
$ip=false;
if(!empty($_SERVER["HTTP_CLIENT_IP"])){
$ip = $_SERVER["HTTP_CLIENT_IP"];
}
if (!empty($_SERVER[&#39;HTTP_X_FORWARDED_FOR&#39;])) {
$ips = explode (", ", $_SERVER[&#39;HTTP_X_FORWARDED_FOR&#39;]);
if ($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[&#39;REMOTE_ADDR&#39;]; 
$ifErr=$QQWry->QQWry($ip); 
$city = $QQWry->Country.$QQWry->Local;
 
//echo $city;*/
 
 
if (strpos($city,&#39;玄武区&#39;)!==false){
  $city = "玄武区";
}
else if(strpos($city,&#39;仙林&#39;)!==false){
  $city = "仙林";
}
else if(strpos($city,&#39;秦淮区&#39;)!==false){
  $city = "秦淮区";
}
else if(strpos($city,&#39;江宁&#39;)!==false){
  $city = "江宁";
}
else if(strpos($city,&#39;鼓楼&#39;)!==false){
  $city = "鼓楼";
}
else{
  $city = "栖霞";
}
if (isset($_GET[&#39;chengshi&#39;])) { //Ê×ÏÈ¼ì²âÊÇ·ñ»ñµÃÁË GET ´«µÝµÄÊý¾Ý  
setcookie("cookie_city",$_GET[&#39;chengshi&#39;],time()+3600*24);
$city = $_GET[&#39;chengshi&#39;]; 
} 
else if (isset($_COOKIE["cookie_city"])) { //¼ì²âÊÇ·ñ´æÔÚêÇ³ÆCookie  
$city = $_COOKIE["cookie_city"]; //ÏÔÊ¾Cookie±£´æµÄÊý¾Ý 
} 
else {  
setcookie("cookie_city",$city,time()+3600*24); //´¿³õÊ¼»¯´Ë±äÁ¿ 
$_COOKIE["cookie_city"] = $city;
} 
?>

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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>城市切换</title>
</head>
<BODY>
<p class=selCity id=allCity style="DISPLAY: none">
<p class=area>
<TABLE>
 <TBODY>
 <TR>
  <TD><A class=cur href="show.html">玄武区</A></TD>
  <TD><A href="show1.html">仙林</A></TD>
  <TD><A href="show2.html">秦淮区</A></TD>
  <TD><A href="show3.html">鼓楼</A></TD>
  <TD><A href="show4.html">江宁</A></TD>
  <TD><A href="show5.html">栖霞区</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">全部小区</A></LI>
         
         <LI class=i1>
         <?php 
         echo $city; 
         ?>
         </LI>
         <LI class=i2 id=changeCity>切换城市</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>

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In addition, the implementation method of netizens is attached:

How to use: After decompression, QQWry.Dat is the IP address database we want. We create a new ipcity folder and place the database below. The QQ IP database is very convenient to use and the data is very complete. You can follow the official updates in time to keep the data up to date. I highly recommend it:)

Next, we create a new ipaddress.php file in the ipcity directory above , just copy the following code into it, and the important places are also commented accordingly. Section B:

<?
/*
函数名称：ipCity
参数说明：$userip——用户IP地址
函数功能：PHP通过IP地址判断用户所在城市
author:lee
contact:xpsem2010@gmail.com
*/
function ipCity($userip) {
  //IP数据库路径，这里用的是QQ IP数据库 20110405 纯真版
  $dat_path = &#39;QQWry.dat&#39;;
  //判断IP地址是否有效
  if(!ereg("^([0-9]{1,3}.){3}[0-9]{1,3}$", $userip)){
    return &#39;IP Address Invalid&#39;;
  }
  //打开IP数据库
  if(!$fd = @fopen($dat_path, &#39;rb&#39;)){
    return &#39;IP data file not exists or access denied&#39;;
  }
  //explode函数分解IP地址，运算得出整数形结果
  $userip = explode(&#39;.&#39;, $userip);
  $useripNum = $userip[0] * 16777216 + $userip[1] * 65536 + $userip[2] * 256 + $userip[3];
  //获取IP地址索引开始和结束位置
  $DataBegin = fread($fd, 4);
  $DataEnd = fread($fd, 4);
  $useripbegin = implode(&#39;&#39;, unpack(&#39;L&#39;, $DataBegin));
  if($useripbegin < 0) $useripbegin += pow(2, 32);
  $useripend = implode(&#39;&#39;, unpack(&#39;L&#39;, $DataEnd));
  if($useripend < 0) $useripend += pow(2, 32);
  $useripAllNum = ($useripend - $useripbegin) / 7 + 1;
  $BeginNum = 0;
  $EndNum = $useripAllNum;
  //使用二分查找法从索引记录中搜索匹配的IP地址记录
  while($userip1num>$useripNum || $userip2num<$useripNum) {
    $Middle= intval(($EndNum + $BeginNum) / 2);
    //偏移指针到索引位置读取4个字节
    fseek($fd, $useripbegin + 7 * $Middle);
    $useripData1 = fread($fd, 4);
    if(strlen($useripData1) < 4) {
      fclose($fd);
      return &#39;File Error&#39;;
    }
    //提取出来的数据转换成长整形，如果数据是负数则加上2的32次幂
    $userip1num = implode(&#39;&#39;, unpack(&#39;L&#39;, $useripData1));
    if($userip1num < 0) $userip1num += pow(2, 32);
    //提取的长整型数大于我们IP地址则修改结束位置进行下一次循环
    if($userip1num > $useripNum) {
      $EndNum = $Middle;
      continue;
    }
    //取完上一个索引后取下一个索引
    $DataSeek = fread($fd, 3);
    if(strlen($DataSeek) < 3) {
      fclose($fd);
      return &#39;File Error&#39;;
    }
    $DataSeek = implode(&#39;&#39;, unpack(&#39;L&#39;, $DataSeek.chr(0)));
    fseek($fd, $DataSeek);
    $useripData2 = fread($fd, 4);
    if(strlen($useripData2) < 4) {
      fclose($fd);
      return &#39;File Error&#39;;
    }
    $userip2num = implode(&#39;&#39;, unpack(&#39;L&#39;, $useripData2));
    if($userip2num < 0) $userip2num += pow(2, 32);
    //找不到IP地址对应城市
    if($userip2num < $useripNum) {
      if($Middle == $BeginNum) {
        fclose($fd);
        return &#39;No Data&#39;;
      }
      $BeginNum = $Middle;
    }
  }
  $useripFlag = fread($fd, 1);
  if($useripFlag == chr(1)) {
    $useripSeek = fread($fd, 3);
    if(strlen($useripSeek) < 3) {
      fclose($fd);
      return &#39;System Error&#39;;
    }
    $useripSeek = implode(&#39;&#39;, unpack(&#39;L&#39;, $useripSeek.chr(0)));
    fseek($fd, $useripSeek);
    $useripFlag = fread($fd, 1);
  }
  if($useripFlag == chr(2)) {
    $AddrSeek = fread($fd, 3);
    if(strlen($AddrSeek) < 3) {
      fclose($fd);
      return &#39;System Error&#39;;
    }
    $useripFlag = fread($fd, 1);
    if($useripFlag == chr(2)) {
      $AddrSeek2 = fread($fd, 3);
      if(strlen($AddrSeek2) < 3) {
        fclose($fd);
        return &#39;System Error&#39;;
      }
      $AddrSeek2 = implode(&#39;&#39;, unpack(&#39;L&#39;, $AddrSeek2.chr(0)));
      fseek($fd, $AddrSeek2);
    } else {
      fseek($fd, -1, SEEK_CUR);
    }
    while(($char = fread($fd, 1)) != chr(0))
      $useripAddr2 .= $char;
    $AddrSeek = implode(&#39;&#39;, unpack(&#39;L&#39;, $AddrSeek.chr(0)));
    fseek($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 &#39;System Error&#39;;
      }
      $AddrSeek2 = implode(&#39;&#39;, unpack(&#39;L&#39;, $AddrSeek2.chr(0)));
      fseek($fd, $AddrSeek2);
    } else {
      fseek($fd, -1, SEEK_CUR);
    }
    while(($char = fread($fd, 1)) != chr(0)){
      $useripAddr2 .= $char;
    }
  }
  fclose($fd);
  //返回IP地址对应的城市结果
  if(preg_match(&#39;/http/i&#39;, $useripAddr2)) {
    $useripAddr2 = &#39;&#39;;
  }
  $useripaddr = "$useripAddr1 $useripAddr2";
  $useripaddr = preg_replace(&#39;/CZ88.Net/is&#39;, &#39;&#39;, $useripaddr);
  $useripaddr = preg_replace(&#39;/^s*/is&#39;, &#39;&#39;, $useripaddr);
  $useripaddr = preg_replace(&#39;/s*$/is&#39;, &#39;&#39;, $useripaddr);
  if(preg_match(&#39;/http/i&#39;, $useripaddr) || $useripaddr == &#39;&#39;) {
    $useripaddr = &#39;No Data&#39;;
  }
  return $useripaddr;
}
?>

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PHP realizes city switching or jumping based on IP address

At this point, the problem is actually very simple. It can be solved with simple js. Section C is as follows:

//根据IP地址跳转指定页面js取得城市
var city=&#39;<?echo ipCity($xp_UserIp);?>&#39;;
//根据IP地址所有城市跳转到指定页面
if(city.indexOf("上海市")>=0){
    window.location.href="http://shanghai.demo.com/";
}

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Place the beginning A section code and the above C section code at the beginning and end of the B section code respectively, and then we add the following code to the page that needs to be jumped:

Refresh the page, does it achieve the desired effect? Woolen cloth?

Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.

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