Code that restricts IP segment access in PHP and prevents IP from submitting forms

Add the following code to the page where you want to prohibit access or submit a form.

Note: Below is just an instance code that restricts IP to PHP, and if you intend to apply it to a CMS, modify it yourself.

<?PHP/Add IP Access Restrictionsif(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 ']; } //Limit IPif($userip= = ' 192.168.1.88 '){ Header("location:http://t.qq.com/wb631992791");//skip to Weibo after being bannedExit; } //restricting IP segments$ip _arr=Explode(‘.‘,$userip); #limit the IP segment, assuming it is 192.168.*.*if(! (($ip _arr[0] = = ' 192 ' &&$ip _arr[1]== ' 168 ') )){ Header("location:http://t.qq.com/wb631992791");//skip to Weibo after being bannedExit; }Else{ Header("location:http://afish.cnblogs.com");//normal IP Direct access to the small fish Court homeExit; } ?>