Make number abbreviation like Trillion (T), Billion (B), Million (M), Thousand (K) etc.

number-abbr.php

<?php

/**
 * Make long number as abbreviation
 *
 * @param float $number
 *
 * @return string
 */
function makeNumberAbbr(float $number): string
{
    $abbrevs = [12 => 'T', 9 => 'B', 6 => 'M', 3 => 'K', 0 => ''];

    foreach ($abbrevs as $exponent => $abbrev) {
        if (abs($number) >= pow(10, $exponent)) {
            $display  = $number / pow(10, $exponent);
            $decimals = ($exponent >= 3 && round($display) < 100) ? 1 : 0;
            $number   = number_format($display, $decimals) . $abbrev;
            break;
        }
    }

    return $number;
}