Code _php tips for restricting IP segment access in PHP, and for preventing IP from submitting forms

We just need to add the following code to the feedback.php to judge it.

Note: The bottom is just a PHP restricted IP instance code, if you intend to apply to the CMS, please modify yourself, or if you are using DEDECMS, you can contact the site.

Copy Code code as follows:

<?php
Add IP Access Restrictions
if (getenv (' http_client_ip ') && strcasecmp (getenv (' http_client_ip '), ' unknown ')) {
$userip = getenv (' http_client_ip ');
} elseif (getenv (' http_x_forwarded_for ') && strcasecmp (getenv (' http_x_forwarded_for '), ' unknown ')) {
$userip = getenv (' http_x_forwarded_for ');
} elseif (getenv (' remote_addr ') && strcasecmp (getenv (' remote_addr '), ' unknown ')) {
$userip = getenv (' remote_addr ');
} elseif (Isset ($_server[' remote_addr ')) && $_server[' remote_addr '] && strcasecmp ($_server[' Remote_ ADDR '], ' unknown ') {
$userip = $_server[' remote_addr '];
}
Restrict IP
if ($userip = = ' 27.37.188.128 ') {
Header ("Location:http://sc.jb51.net"), and/or prohibited to jump to the cloud Habitat Community Station
Exit
}
restricting IP Segments
$ip _arr = Explode ('. ', $userip);
#限制的ip段, assuming it's 192.168.*.*.
if (!) ( ($ip _arr[0] = = ' 168 ' && $ip _arr[1]== ')) {
Header ("Location:http://sc.jb51.net"), and/or prohibited to jump to the cloud Habitat Community material Station
Exit
}else{
Header ("location:http://www.jb51.net");/normal IP direct access to cloud Habitat Community home
Exit
}
?>