whmcsTools/check_billing_cycle.php

<?php

/**
* push current product billing cycle to upgrade form
* converts the string into a format which matches {$upgradepackage.pricing.type}
* "Free Account" => free
* "One Time" => onetime
* "Monthly" => monthly
* "Quarterly" => quarterly
* "Semi-Annually" => semiannually
* "Annually" => annually
* "Biennially" => biennially
* "Triennially" => triennially
* @author Thurdata
*/

use Illuminate\Database\Capsule\Manager as Capsule;

function current_billingcycle_hook($vars)
{
   if ($vars['templatefile']=='upgrade' || $vars['templatefile']=='upgradesummary'){
       $id = $vars['id'];
       $billingcycle = Capsule::table('tblhosting')
               ->where('id',$id)
               ->value('billingcycle');
        return array("curbillingcycle" => strtolower(str_replace('Account','',str_replace(' ','',str_replace('-','',$billingcycle)))));
    }
}
add_hook("ClientAreaPageUpgrade", 1, "current_billingcycle_hook");