How to implement filtering IP black and white lists in PHP

function ip_test($ip,$iprule){
 $ipruleregexp=str_replace('.*','ph',$iprule);
 $ipruleregexp=preg_quote($ipruleregexp,'/');
 $ ipruleregexp=str_replace('ph','.[0-9]{1,3}',$ipruleregexp);

 if(preg_match('/^'.$ipruleregexp.'$/',$ip)) return true;
 else return false;
}

After implementing the core function ip_test, the following process is much simpler. It is nothing more than simply traversing each rule in the list to determine the currently connected IP Whether it complies with the rules and take the corresponding steps. Whitelist, proceed when an IP meets at least one rule:

$curr_ip=$_SERVER['REMOTE_ADDR'];
$white_list=array(...); //Whitelist rules
$test_success=false;
foreach($white_list as $iprule){
 if(ip_test($curr_ip,$iprule)){
 $test_success=true;
 break;
 }
 }
 if(!$test_success) exit('IP not in white list');

Blacklist, proceed when IP does not meet all rules:

$curr_ip=$_SERVER['REMOTE_ADDR'];
 $black_list=array(...); //Blacklist rules
 foreach($black_list as $iprule){
 if(ip_test($curr_ip ,$iprule)){
 exit('IP in black list');
 }
 }

At this point, a simple PHP implementation of IP black and white list filtering is completed. I hope it can be used by everyone. Come help. Articles you may be interested in:

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