$dSort\n";
	// print_r( $sqls );
	
	/// [NL:2020-04-06] troubleshooting; added checkout indexes and was already greatly improved - implement this later
	// example query from menu.php: [0] => SELECT Count(*) FROM invoice LEFT JOIN checkout ON invoice.checkoutID=checkout.ID WHERE invoice.affiliateID=0 AND s_InstallDate LIKE '01 April%' AND s_InstallYear='2020' AND hidden='N'
	/* !! modify to adjust month name and length: (updated)
			SELECT Mid(s_InstallDate, 1, 8) `day`, Count(*) `num`
			FROM invoice LEFT JOIN checkout ON invoice.checkoutID = checkout.ID 
			WHERE invoice.affiliateID = 0 AND Mid(s_InstallDate, 4, 5) = 'April' AND s_InstallYear='2020' AND hidden='N' 
			GROUP BY Mid(s_InstallDate, 1, 8)
	*/

} // makeCal()


///-------------------------------------------------------------------------
function days_in_month( $month, $leap ) {

	switch( $month ) {
		case 2: return $leap ? 29 : 28;
		case 4: case 6: case 9: case 11: return 30;
		default: return 31;
	}

} // days_in_month()


//-------------------------------------------------------------------------
// is_leap_year:  Just returns true if the specified year is a leap year.
//-------------------------------------------------------------------------
function is_leap_year( $year ) {

	return ($year % 4 == 0) ? 1 : 0;

} // is_leap_year()


//-------------------------------------------------------------------------
// first_day_of_month: returns the numeric day of the week,  "0" (Sunday) to "6" (Saturday) 
//-------------------------------------------------------------------------
function first_day_of_month( $month, $year ) {

	$firstDay = date("w" ,mktime(0,0,0,$month,1,$year));
	return $firstDay;

} // first_day_of_month()


//-------------------------------------------------------------------------
// microtime_float:  Simple function to replicate PHP 5 behaviour.
//-------------------------------------------------------------------------
function microtime_float() { 

	list($usec, $sec) = explode(" ", microtime()); 
	return ((float)$usec + (float)$sec); 

} // microtime_float()