Masking the VIN of car

vin_mask.php

<?php

if (!function_exists('vin_mask')) {
    function vin_mask(string $value)
    {
        $length = strlen($value);
        $count  = 8;

        $start = mb_substr($value, 0, $count, 'UTF-8');
        $end   = mb_substr($value, $length - 2, null, 'UTF-8');

        $pad = str_pad($end, ($length - $count), '*', STR_PAD_LEFT);

        return $start . $pad;
    }
}

/**
 *  $str = 'ABCDE12F123456789';
 *
 *  return vin_mask($str);
 *  // ABCDE12F*******89
 */