This article introduces two functions: one is to verify the IP address, and the other is to obtain the real IP address of the user. It is also a common operation function of two IP addresses. If you need it, you can refer to it.
Obtain the real IP address of a user
| The Code is as follows: |
Copy code |
Function get_client_ip ()
{
If (getenv ("REMOTE_ADDR") & strcasecmp (getenv ("REMOTE_ADDR"), "unknown "))
{
$ Onlineip = getenv ("REMOTE_ADDR ");
Return $ onlineip;
}
If (isset ($ _ SERVER ['remote _ ADDR ']) & $ _ SERVER ['remote _ ADDR '] & strcasecmp ($ _ SERVER ['remote _ ADDR'], "unknown "))
{
$ Onlineip = $ _ SERVER ['remote _ ADDR '];
Return $ onlineip;
}
If (getenv ("HTTP_CLIENT_IP") & strcasecmp (getenv ("HTTP_CLIENT_IP"), "unknown "))
{
$ Onlineip = getenv ("HTTP_CLIENT_IP ");
Return $ onlineip;
}
If (getenv ("HTTP_X_FORWARDED_FOR") & strcasecmp (getenv ("HTTP_X_FORWARDED_FOR"), "unknown "))
{
$ Onlineip = getenv ("HTTP_X_FORWARDED_FOR ");
}
Return $ onlineip;
} |
Determines whether it is an IP address.
| The Code is as follows: |
Copy code |
Function is_ip ($ IP)
{
$ IP_ARRAY = explode (".", $ IP );
$ IP_ARRAY_NUM = sizeof ($ IP_ARRAY );
If ($ IP_ARRAY_NUM! = 4)
{
Return FALSE;
}
$ I = 0;
For (; $ I <$ IP_ARRAY_NUM; ++ $ I)
{
If (! Is_numeric ($ IP_ARRAY [$ I]) & $ IP_ARRAY [$ I] <0 | 255 <$ IP_ARRAY [$ I])
{
Return FALSE;
}
If (! ($ I = 3 )&&! ($ IP_ARRAY [$ I] = 255 ))
{
Continue;
}
Return FALSE;
}
Return TRUE;
}
|
