PHP : How do I add a week without using the strtotime function? - php

Question

I'm hoping that my concern will be answered as soon as possible. :) So here it is: I'm having a hard time solving this problem, as shown below:
$beg_week = "2014 - 49"; //yyyy - w
$stop_wk = "2015 - 5"
while($beg_week <= $stop_wk)
{
/* do logic to add week in the format "yyyy - w", but also
* have to consider the year */
$beg_week = '';
}
So, how can I add a week in a 'yyyy - w' format, without using strtotime()?

Answer 1

Convert your start and end times to timestamps using date_parse_from_format() and mktime(). Alternatively, use an SQL function like MySQL's UNIX_TIMESTAMP() if retrieving data from a datetime field.
Use date_parse_from_format() to break the date into its components.
Use mktime() to get a timestamp
Add a week's worth of seconds (60 * 60 * 24 * 7)
Use date() to output the next week.
Note: date_parse*() won't log/store an error in the returned array if you have more than 29 or 28 days in February (for a leap or regular year, respectively). This might/might not matter, depending on what you're using it for.

Answer 2

There is no need to jump through hoops with date() and mktime() for this. The DateTime classes can handle it simply and cleanly, something like this should work for you:-
$beg_week = (new \DateTime())->setISODate(2014, 49);
$stop_week = (new \DateTime())->setISODate(2015, 5);
$interval = new \DateInterval('P7D');
while($beg_week < $stop_week){
echo $beg_week->format('Y-m-d') . "<br/>\n";
$beg_week->add($interval);
}

Answer 3

Sorry it took so long before I am able to solved and share the method/approach that I used for this matter, since I've got an additional project than this. So what i did was:
First, build a function that gets the max week of a year(thanks to #salathe),
function getIsoWeekYear($year)
{
$date = new DateTime;
$date->setISODate($year,53);
return ($date->format("W") === "53" ? 53 : 52);
}
Then to increment the value of a week, considering also the given year,
$beg_week = "2014 - 50"; //just a sample and not actually a string
$end_week = "2015 - 05";
while($beg_week<=$end_week)
(
$out_data[] = $beg_week;
$b_week_exp = explode(" - ",$beg_week);
$b_yr_temp = $b_week_exp[0];
$b_wk_temp = $b_week_exp[1];
$max_wk_of_yr = getIsoWeeksInYear($b_yr_temp);
$out_year = $b_yr_temp;
$out_week_no = $b_wk_temp+1;
if($out_week_no > $max_wk_of_yr)
{
$out_year = $b_yr_temp+1;
$out_week_no = "1";
}
$beg_week = $out_year." - ".sprintf("%02s", $out_week_no);
)
That's it, if you will print_r the $out_data, you will have an array of,
2014 - 50
2014 - 51
2014 - 52
2015 - 01
2015 - 02
2015 - 03
2015 - 04
2015 - 05
Well, this logic is what I want, to have loop from $beg_week up to $end_week, because there's also a logic that I am executing in it. A very simple trick, for this very simple problem! :) Sorry, SOMETIMES I am that sluggish not to answer my own question/problem. I hope this one will help to anyone who'll also encounter this same scenario. Thank you!