convert large numbers to abbreviations

numFormat.php

<?php
function numFormat($number) {
    if(!$number){
        return $number;
    }

    $abbrevs = array(18 => "Q", 15 => "q", 12 => "t", 9 => "B", 6 => "M", 3 => "K", 0 => "");
    foreach($abbrevs as $exponent => $abbrev) {
        if($number >= pow(10, $exponent)) {
            $display_num = $number / pow(10, $exponent);
            $decimals = ($exponent >= 3 && round($display_num) < 100) ? 1 : 0;
            return number_format($display_num,$decimals) . $abbrev;
        }
    }
}