sample reference generator

reference_helper.php

function generateReference(): string
{
    $characters = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $randomString = '';
    
    for ($i = 0; $i < 16; $i++) {
        $randomString .= $characters[rand(0, strlen($characters) - 1)];
    }
    
    return 'REF' . $randomString;
}