How can I run a DateTime with for or foreach loop to loop through each day and add +3 days to each?

I have 2 dates in PHP, how can I run a for or foreach loop to loop through each day and add +3 days to each?

below I add an example of how I want to get the listing.

  <?php
  $begin = new DateTime( "2022-01-01" );
  $end   = new DateTime( "2022-01-31" );
  for($i=$begin; $i<=$end; $i->modify('+1 day')){    
    for($j=$begin; $j<=$end; $j->modify('+3 day')){
      
      echo $i->format("M d, Y").' => ';
      echo $j->format("M d, Y").'<br/><br/>';
      
      /*  I WANTS TO GET

      * Jan 01, 2022 => Jan 04, 2022
      * Jan 02, 2022 => Jan 05, 2022
      * Jan 03, 2022 => Jan 06, 2022
      *...
      *...
      * Jan 31, 2022 => Feb 03, 2022
      */

    }    
  }    
?>

>Solution :

If the end date is always simply three days from the start, then you only need one loop, over the start date. Then, instead of a second loop to set the ending date, just set it relative to the start, on each iteration:

for ($start = $begin; $start <= $end; $start->modify('+1 day')) {    
    $stop = clone $start;
    $stop->modify('+3 days');
    printf("%s => %s\n", $start->format("M d, Y"), $stop->format("M d, Y"));
}

Note you need to make a new date object via clone so that your second modification of +3 days doesn’t change the start date.