Truncate amount in Indian money format like Lakh, Koti (Lac, Crore), and in US money format like Million, Billion, Trillion etc.

truncateAmount.php

<?php
/**
 * Truncate Amount (in Indian format).
 *
 * Return amount in lac/koti etc.
 *
 * @param integer $amount Amount.
 *
 * @link https://stackoverflow.com/q/42571702/1743124 (Concept)
 *
 * @author Mayeenul Islam <wz.islam@gmail.com>
 * @link   https://gist.github.com/mayeenulislam/9cbd7bc260ccd64575c942872b48b5bc
 *
 * @return array Array of truncated amount and label.
 */
function truncateAmountIndian($amount)
{
    // Known issue: strlen() on string returns wrong estimation.
    $length = strlen((float) $amount);

    if ($length <= 3) {
        $amountOutput = (int) $amount;
        $label = '';
    } elseif ($length === 4 || $length === 5) {
        // 1,000 - 99,999.
        $amountOutput = round(($amount / 1000), 2);
        $label = 'k';
    } elseif ($length === 6 || $length === 7) {
        // 1,00,000 - 99,99,999.
        $amountOutput = round(($amount / 100000), 2);
        $label = 'Lac';
    } elseif ($length > 7) {
        // 1,00,00,000 - 99,99,99,999+.
        $amountOutput = round(($amount / 10000000), 2);
        $label = 'Cr.';
    }

    return array(
        'amount' => $amountOutput,
        'label'  => $label,
    );
}

/**
 * Truncate Amount (in US format).
 *
 * Return amount in million/billion/trillion etc.
 *
 * @param integer $amount Amount.
 *
 * Source: unknown
 *
 * @return array Array of truncated amount and label.
 */
function truncateAmountUS($amount)
{
    // filter and format it
    if ($amount < 1000) {
        // 0 - 1000
        $amountOutput = (int) $amount;
        $label = '';
    } elseif ($amount < 900000) {
        // 0.9k-850k
        $amountOutput = round(($amount / 1000), 2);
        $label = 'k';
    } elseif ($amount < 900000000) {
        // 0.9m-850m
        $amountOutput = round(($amount / 1000000), 2);
        $label = 'm';
    } elseif ($amount < 900000000000) {
        // 0.9b-850b
        $amountOutput = round(($amount / 1000000000), 2);
        $label = 'b';
    } else {
        // 0.9t+
        $amountOutput = round(($amount / 1000000000000), 2);
        $label = 't';
    }

    return array(
        'amount' => $amountOutput,
        'label'  => $label,
    );
}