Get a list of (date) quarters between two given dates. Return array of objects with information about each quarter

list_quarters.php

<?php 

// get month name from number
function month_name($month_number){
	return date('F', mktime(0, 0, 0, $month_number, 10));
}


// get get last date of given month (of year)
function month_end_date($year, $month_number){
	return date("t", strtotime("$year-$month_number-0"));
}

// return two digit month or day, e.g. 04 - April
function zero_pad($number){
	if($number < 10)
		return "0$number";
	
	return "$number";
}

// Return quarters between tow dates. Array of objects
function get_quarters($start_date, $end_date){
	
	$quarters = array();
	
	$start_month = date( 'm', strtotime($start_date) );
	$start_year = date( 'Y', strtotime($start_date) );
	
	$end_month = date( 'm', strtotime($end_date) );
	$end_year = date( 'Y', strtotime($end_date) );
	
	$start_quarter = ceil($start_month/3);
	$end_quarter = ceil($end_month/3);

	$quarter = $start_quarter; // variable to track current quarter
	
	// Loop over years and quarters to create array
	for( $y = $start_year; $y <= $end_year; $y++ ){
		if($y == $end_year)
			$max_qtr = $end_quarter;
		else
			$max_qtr = 4;
		
		for($q=$quarter; $q<=$max_qtr; $q++){
			
			$current_quarter = new stdClass();
			
			$end_month_num = zero_pad($q * 3);
			$start_month_num = ($end_month_num - 2);

			$q_start_month = month_name($start_month_num);
			$q_end_month = month_name($end_month_num);
			
			$current_quarter->period = "Qtr $q ($q_start_month - $q_end_month) $y";
			$current_quarter->period_start = "$y-$start_month_num-01";      // yyyy-mm-dd    
			$current_quarter->period_end = "$y-$end_month_num-" . month_end_date($y, $end_month_num);
			
			$quarters[] = $current_quarter;
			unset($current_quarter);
		}

		$quarter = 1; // reset to 1 for next year
	}
	
	return $quarters;
	
}

$quarters = get_quarters('2010-04-05', '2015-05-01');
       

// Test	   
echo '<pre>';
print_r($quarters);
echo '</pre>';