Abbreviate a number (e.g. 1723 => "1.7k")

AbbrevNumbers.php

<?php

    /**
     * Abbreviate a number.
     *
     * @param int $number
     * @return string
     */
    public static function abbrev(int $number)
    {
        $abbrevs = array(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;
            }
        }

        return number_format(is_numeric($display_num) ? $display_num : 0, 0);
    }