PHP: retrieve month and year of the next month

This should do it

<?php
$month = array (
	'Januari',
	'Februari',
	'Maart',
	'April',
	'Mei',
	'Juni',
	'Juli',
	'Augustus',
	'September',
	'Oktober',
	'November',
	'December'
);

$date = new DateTime();
$date->add(new DateInterval('P1M'));
echo $month[intval($date->format('m')) - 1] . ' ' . $date->format('Y');
?>

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Here is a better solution using setlocale instead of the array

<?php
setlocale(LC_TIME, 'nld_NLD');

$date = new DateTime();
$date->add(new DateInterval('P1M'));
echo strftime("%B %Y", strtotime($date->format('Y-m')));
?>

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Thanks.
Can you show me how I can use this as a function?

As your initial requirement says to use the current date - here is a function that does what you require.

function get_month_year()
{
  setlocale(LC_TIME, 'nld_NLD');

  $date = new DateTime();
  $date->add(new DateInterval('P1M'));
  return strftime("%B %Y", strtotime($date->format('Y-m')));
?>
}

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Re the comments on setLocale - it does require some tweaking depending on whether you are running on windows or Linux - but you should know which system you are runnign on and it is a trivial thing to be able to set the correct value. You could even write a bit of code that auto detects and calls the right parameter.
Either way - a lot better than having to maintain an array of months.

@Ray
// THIS RETURNS IN ENGLISH - INVALID LOCALE?  NO MESSAGE AT ALL!
setlocale(LC_TIME, 'nld_NLD');

That works on Windows systems

For Linux

setLocale(LC_TIME, 'nl_NL')

Should do the trick

Yes, that's why I wrote...

The man page says, " Different systems have different naming schemes for locales."  There are some illuminating and cautionary user-contributed notes on the man page!

Also, this is kind of a grin... When was the last time you needed an update to the list of months?  Not in my lifetime, IIRC :-)

better than having to maintain an array of months

@Ray:This solution has much more code, though I can strip the other languages. Most important it works without me having to make any changes.
@JulianH: Your code gives me just an errormessage and I believe that local settings might influence the outcome, where Ray's code will always produce the same result.
Thank you both.

@JulianH: the error I get is:
Fatal error: Call to undefined method DateTime::add() in /home/mydomain/domains/mysite.nl/public_html/includes/functions/functions.shopcart.php on line 269

If you are using a version of PHP < 5.2 then that would explain the issue.

@JulianH: I don't know which version is installed. It's maintained by the webhosting company. I'm in the impression that they keep the servers updated with the latest versions, but that might not always be the case. Thank you for the info.

To find out the version create this file
pi.php

<?php
phpinfo();
?>

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Upload and call that script - version will be displayed at the top of the page. If running on less than 5.2 you might want to check if you can upgrade - PHP currently at version 5.4

Here is a link to the code on a windows server. The script has an extra line to determine OS and set locale string correctly

And here is the code running at that site.

<?php
// Set locale string based on OS
$locale = (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') ? 'nld_NLD' : 'nl_NL';
setlocale(LC_TIME, $locale);

$date = new DateTime();
$date->add(new DateInterval('P1M'));
echo strftime("%B %Y", strtotime($date->format('Y-m')));
?>

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Slightly less longwinded than the accepted solution but does require 5.2 or higher

PHP Version 5.2.17
Running the new script still gives the error.

Seems - you need 5.3

http://www.php.net/manual/en/datetime.add.php

Thank you. Now we know what went wrong...