PHP access to the local network/public network IP code _php skills

We generally use $_server[' remote_addr ' to get User IP,

However, if the reverse proxy is used, the REMOTE_ADDR in the HTTP header is not the user's address, but the address of the agent at the top level.

After my research there are two ways to get the user's real extranet IP.


Method One: Curl

Copy Code code as follows:

function Get_onlineip () {
$ch = Curl_init (' http://www.ip138.com/ip2city.asp ');
curl_setopt ($ch, Curlopt_returntransfer, true);
$a = curl_exec ($ch);
Preg_match ('/\[(. *) \]/', $a, $ip);
return $IP [1];
}

Method Two: $_server[' http_x_forwarded_for ' to obtain the corresponding address

Copy Code code as follows:

function Get_onlineip () {
$onlineip = ';
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 '];
}
Return $ONLINEIP;
}