PHP implements encapsulation class to obtain client and server IP

This article mainly introduces the encapsulation class for PHP to obtain client and server IP. It briefly analyzes the basic usage of PHP using server predefined variables and performs a simple encapsulation. Friends who need it can refer to it

The details are as follows:

Client IP related variables:

1. $_SERVER['REMOTE_ADDR']; Client IP, which may be the user’s IP, It may also be the proxy IP.

2. $_SERVER['HTTP_CLIENT_IP']; The IP of the agent may exist and can be forged.

3. $_SERVER['HTTP_X_FORWARDED_FOR']; Which IP the user uses as a proxy may exist and can be forged.

Server-side IP related variables:

1. $_SERVER["SERVER_NAME"] needs to be obtained using the function gethostbyname(). This variable displays correctly on both the server and client sides.

2. $_SERVER["SERVER_ADDR"], tested on the server side: 127.0.0.1 (this is related to the setting value of BindAddress in httpd.conf). The test results on the client are correct.

The categories are as follows:

class getIP{
 function clientIP(){
 $cIP = getenv('REMOTE_ADDR');
 $cIP1 = getenv('HTTP_X_FORWARDED_FOR');
 $cIP2 = getenv('HTTP_CLIENT_IP');
 $cIP1 ? $cIP = $cIP1 : null;
 $cIP2 ? $cIP = $cIP2 : null;
 return $cIP;
 }
 function serverIP(){
 return gethostbyname($_SERVER["SERVER_NAME"]);
 }
}
$getIP = new getIP();
$clientIp = getIP::clientIP();
$serverIp = getIP::serverIP();
echo &#39;Client IP is &#39;,$clientIp,&#39;<br />&#39;;
echo &#39;Server IP is &#39;,$serverIp,&#39;<br />&#39;;

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