Shorten large numbers into abbreviations (i.e. 1,500 = 1.5k), (slightly optimized)

numberAbbreviation.php

<?php
/**
 * Shorten large numbers into abbreviations (i.e. 1,500 = 1.5k)
 *
 * @param int    $number  Number to shorten
 * @return String   A number with a symbol
 */ 
function numberAbbreviation($number) {
    $abbrevs = [1000000000000 => 'T', 1000000000 => 'B', 1000000 => 'M', 1000 => 'K', 1 => ''];

    foreach ($abbrevs as $diapason_min => $abbrev) {
        if ($number >= $diapason_min) {
            $display_num = $number / $diapason_min;
            $decimals = ($diapason_min >= 1000 && round($display_num) < 100) ? 1 : 0;

            return number_format($display_num, $decimals) . $abbrev;
        }
    }

    return $number;
}
?>