How does php disable access from an ip address or ip address segment?

This article mainly introduces how php disables access from an ip address or ip address segment, and involves the operating skills of the SERVER variable $ _ SERVER, files, and strings. it has some reference value, for more information about how php disables access from an ip address or CIDR block, see the following example. The specific analysis is as follows:

Because I have not studied Apache and nginx in depth, I used PHP to write a small program that can disable the address.
You only need:

<?php include("banIP.php");?>

You can.

Disable a single ip address as follows:

<? Php // disable ip address $ ip = $ _ SERVER ["REMOTE_ADDR"]; $ ban = file_get_contents ("ban. dat "); if (stripos ($ ban, $ ip) {die (" Your IP Address is: $ ip, you're forbiden to view this page! ");} Echo" Your IP Address is: $ ip, hello! ";?>

The ban. dat file is as follows:

BEGIN: 119.184.251.245 127.0.0.1 192.168.1.100 

The disabled ip segment is as follows:

<? Php // disable ip address $ ip = $ _ SERVER ["REMOTE_ADDR"]; while ($ ip [count ($ IP-1)]! = '. ') $ Ip = substr ($ ip, 1,-1); // sort out the ip segment $ ban = file_get_contents ("ban. dat "); if (stripos ($ ban, $ ip) {die (" U'RE forbiden to view this page! ");} Echo" Hello! ";?>

I hope this article will help you with php programming.