Rounding Something's Cost

<?php

function ceiling($number, $significance = 1000) {
    $ratusan = $number % 1000;
    $pembulatan_ratusan = ceil($ratusan / $significance) * $significance;
    $ribuan = $number - $ratusan;
    return $ratusan <= 500 ? $ribuan : $ribuan + $pembulatan_ratusan;
    // return ( is_numeric($number) && is_numeric($significance) ) ? (ceil($number/$significance)*$significance) : false;
}

echo ceiling(12500, 1000);