repeat value in a php array

Question

I want to do a schedule pattern that repeat the value every 4 days... Below the php script is looping the date from 1-Sept til 30-Sept.I want to repeat the value for every 4 days... For example, my value is (A,B,C,D) and I want to repeat it every 4day...thats mean

1/9 = A 
2/9 = B 
3/9 = C 
4/9 = D 
5/9 = A 
6/9 = B 
7/9 = C 
8/9 = D

...... til 30/9 then stop...

<?php  
// Set timezone
date_default_timezone_set('UTC');

// Start date
$start_date = '2015-09-01';
// End date
$end_date = '2015-09-30';

$value = "A";

while (strtotime($start_date) <= strtotime($end_date)) {
echo "$start_date <br>";
$start_date = date ("Y-m-d", strtotime("+1 day", strtotime($start_date)));

}
 ?>

David Ferenczy Rogožan · Accepted Answer · 2015-09-25 01:39:42Z

1

What about something like this:

$values = ['A', 'B', 'C', 'D'];

// Start date
$start_date = '2015-09-01';
// End date
$end_date = '2015-09-30';

$current_date = $start_date;
$index = 0;
while (strtotime($current_date) <= strtotime($end_date)) {
    $i = $index % count($values);
    echo "$current_date: $values[$i]\n";
    $current_date = date("Y-m-d", strtotime("+1 day", strtotime($current_date)));
    $index++;
}

% is a modulus operator, which returns remainder of a division. $a % $b returns remainder of $a divided by $b. So for example 6 % 4 is 2, 7 % 4 is is 3 and so on.

edited Sep 25, 2015 at 1:39

answered Sep 25, 2015 at 1:25

David Ferenczy Rogožan

25.7k12 gold badges88 silver badges73 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

David Ferenczy Rogožan Over a year ago

You're welcome, I'm glad it helped you. You can also up-vote my answer as a reward ;)

mvw Over a year ago

count($values) can be pulled out of the loop.

mvw Over a year ago

You can avoid three strtotime date string to UNIX time conversions per iteration.

David Ferenczy Rogožan Over a year ago

@mvw Put it as a comment of the question, please. It's his code, not mine. I didn't change his code so he can easily recognize, what's solution to his question. But I agree with your comments.

mvw · Accepted Answer · 2015-09-25 01:58:23Z

1

And another version:

<?php  
// Set timezone
date_default_timezone_set('UTC');

// Start date
$start_date = strtotime('2015-09-01');
// End date
$end_date = strtotime('2015-09-30');

$value = "A";

for ($date = $start_date; $date <= $end_date; 
     $date = strtotime("+1 day", $date)) {
  $date_str = date("Y-m-d", $date);
  echo "$date_str: $value<br>\n";
  $value++;
  if ($value > "D") {
    $value = "A";
  }
}
?>

Note: While the variables have date suffixes, they contain UNIX time values, and not some kind of date object.

edited Sep 25, 2015 at 1:58

answered Sep 25, 2015 at 1:31

mvw

5,1151 gold badge30 silver badges36 bronze badges

3 Comments

David Ferenczy Rogožan Over a year ago

This will work only in this specific case, but not for example for these values: $values = ['first', 'second', 'third', 'fourth'].

mvw Over a year ago

It would also work for 42,43,44,45 and all types that are ordered, have addition defined, and when the values succeed each other.

David Ferenczy Rogožan Over a year ago

Yep, but that's what I'm talking about - it will work for specific input values only, it's not general algorithm. So it would be good to make a note about that in your answer. I'm not saying it's bad, I'm saying that it will work just for a very specific cases.

MaveRick · Accepted Answer · 2015-09-25 01:26:40Z

0

<?php
// Set timezone
date_default_timezone_set('UTC');

// Start date
$start_date = '2015-09-01';
// End date
$end_date   = '2015-09-30';

$value = array(
    "A",
    "B",
    "C",
    "D"
);
$i     = 0;
while (strtotime($start_date) <= strtotime($end_date)) {
    echo "$start_date = " . $value[$i] . " <br>";
    if ($i == count($value) - 1) {
        $i = 0;
    } else {
        $i++;
    }
    $start_date = date("Y-m-d", strtotime("+1 day", strtotime($start_date)));

}
?>

answered Sep 25, 2015 at 1:26

MaveRick

1,1896 silver badges20 bronze badges

Collectives™ on Stack Overflow

repeat value in a php array

3 Answers 3

4 Comments

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

4 Comments

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related