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

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
      */

    }    
  }    
?>

CodePudding user response：

Using the DateInterval() and DatePeriod() its a simple case of setting the parameters and running a loop

$begin = new DateTime( "2022-01-01" );
$end   = new DateTime( "2022-01-31" );

$interval = new DateInterval('P1D');
$daterange = new DatePeriod($begin, $interval ,$end);

foreach($daterange as $dateFrom){
    $to = clone $dateFrom;
    echo sprintf("%s => %s\n", 
                    $dateFrom->format("M d, Y"), 
                    $to->modify('3 day')->format("M d, Y")
        );  
}

RESULT

Jan 01, 2022 => Jan 04, 2022
Jan 02, 2022 => Jan 05, 2022
Jan 03, 2022 => Jan 06, 2022
Jan 04, 2022 => Jan 07, 2022
Jan 05, 2022 => Jan 08, 2022
Jan 06, 2022 => Jan 09, 2022
Jan 07, 2022 => Jan 10, 2022
Jan 08, 2022 => Jan 11, 2022
Jan 09, 2022 => Jan 12, 2022
Jan 10, 2022 => Jan 13, 2022
Jan 11, 2022 => Jan 14, 2022
Jan 12, 2022 => Jan 15, 2022
Jan 13, 2022 => Jan 16, 2022
Jan 14, 2022 => Jan 17, 2022
Jan 15, 2022 => Jan 18, 2022
Jan 16, 2022 => Jan 19, 2022
Jan 17, 2022 => Jan 20, 2022
Jan 18, 2022 => Jan 21, 2022
Jan 19, 2022 => Jan 22, 2022
Jan 20, 2022 => Jan 23, 2022
Jan 21, 2022 => Jan 24, 2022
Jan 22, 2022 => Jan 25, 2022
Jan 23, 2022 => Jan 26, 2022
Jan 24, 2022 => Jan 27, 2022
Jan 25, 2022 => Jan 28, 2022
Jan 26, 2022 => Jan 29, 2022
Jan 27, 2022 => Jan 30, 2022
Jan 28, 2022 => Jan 31, 2022
Jan 29, 2022 => Feb 01, 2022
Jan 30, 2022 => Feb 02, 2022

CodePudding user response：

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.

CodePudding user response：

You can also just use the same DateTime object for all of it if you like.

for ($i = $begin; $i <= $end; $i->modify('-2 day')) {
    echo $i->format("M d, Y") . ' => ';
    echo $i->modify(' 3 day')->format("M d, Y") . '<br><br>';
}