Rounding number to nearest multiple number you want

rounding_to_nearest.php

<?php 
function round_up_to_nearest_n($int, $n) {
    return ceil($int / $n) * $n;
}

//result will be 10100
round_up_to_nearest(10001,100);

//result will be 100000
round_up_to_nearest(85000,50000);

//result will be 1000000
round_up_to_nearest(934353,100000);