Easy way to get days of current quarter in php

Pass the frequency and current date to get an array of dates.

eg.
getDatesForYear(4,'2011-01-01');
the array you get will have the following dates
"2011-04-30","2011-08-31","2011-12-31"

public function getDatesForYear($monthlyFequency,$date){

$dateParts = explode("-",$date);

 $firstDayOfTheYear = $dateParts[0] . '-01-01';

 $lastDayOfTheYear = $dateParts[0] . '-12-31';
 
 $i = $firstDayOfTheYear;

for(strtotime($i);strtotime($i)<=strtotime($lastDayOfTheYear);) {
 
 $accruDate[] = date('Y-m-d',strtotime($i . " +$monthlyFequency months  -1 day ")) ;
 $i =  date('Y-m-d',strtotime($i . " +$monthlyFequency months"));
 } return $accruDate;
 }