PHP restricts IP access to only allow access from specified IP addresses

/**
 * Check whether the accessed IP is a specified allowed IP
 * Enter description here...
*/
function check_ip(){
 $ALLOWED_IP=array('192.168.2.*','127.0.0.1','192.168 .2.49');
 $IP=getIP();
 $check_ip_arr= explode('.',$IP);//Split the IP to be detected into an array
 #Restrict IP
 if(!in_array($IP, $ALLOWED_IP)) {
 foreach ($ALLOWED_IP as $val){
 if(strpos($val,'*')!==false){//Found * substitution symbol
 $arr=array();/ /
 $arr=explode('.', $val);
 $bl=true;//Used to record whether there is a successful match in loop detection
 for($i=0;$i<4;$i++) {
 if($arr[$i]!='*'){//If it is not equal to *, it will be checked. If it is a * symbol replacement, it will not be checked
 if($arr[$i]!=$check_ip_arr[ $i]){
 $bl=false;
 break;//Stop checking this ip and continue checking the next ip
 }
 }
 }//end for
 if($bl){//If it is true, find it If there is a successful match, return
 return;
 die;
 }
 }
 }//end foreach
 header('HTTP/1.1 403 Forbidden');
 echo "Access forbidden";
 die;
 }
} < ;/p>
/**
 * Obtain accessed IP
 * Enter description here...
*/
function getIP() {
 return isset($_SERVER["HTTP_X_FORWARDED_FOR"])?$_SERVER["HTTP_X_FORWARDED_FOR"]
 :(isset($_SERVER ["HTTP_CLIENT_IP"])?$_SERVER["HTTP_CLIENT_IP"]
 :$_SERVER["REMOTE_ADDR"]);
}

Call method: In the required files, add the call check_ip(); to achieve the purpose of IP access restriction; This function allows only the specified IP to access the file, and provides the wildcard character * in the IP to match multiple IPs.