PHP only allows specified IP to access of allows * wildcard character to filter IP

The core function code is as follows:

/**
 *  Detect the accessed ip Is it allowed by the regulations 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);// To be detected ip Split into arrays 
	# Limit IP
	if(!in_array($IP,$ALLOWED_IP)) {
		foreach ($ALLOWED_IP as $val){
		  if(strpos($val,'*')!==false){// Found to have * Sign substitute 
		  	 $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]!='*'){// Not equal to *  It is necessary to come in for testing. If it is * Symbol substitutes are not checked 
		  	 		if($arr[$i]!=$check_ip_arr[$i]){
		  	 			$bl=false;
		  	 			break;// Terminate the inspection of this ip  Keep checking 1 A ip
		  	 		}
		  	 	}
		  	 }//end for 
		  	 if($bl){// If it is true You find a 1 If the match is successful, it will return 
		  	 	return;
		  	 	die;
		  	 }
		  }
		}//end foreach
		header('HTTP/1.1 403 Forbidden');
		echo "Access forbidden";
		die;
	}
}
*  Obtain access to 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"]); 
}

Add the call check_ip () where it needs to be detected; That is enough; This function only allows the specified IP to access the file, and provides a * wildcard character in IP to match multiple IP