<?php

	echo masked_ip( '192.168.0.1' ) . PHP_EOL;
	echo masked_ip( '192.168.10.31' ) . PHP_EOL;
	echo masked_ip( '192.168.12.132' ) . PHP_EOL;

	function masked_ip( $ip ) {
 		return substr( $ip, 0, strrpos( $ip, '.' ) - 1 ).'*.***';
	}