Req #70381 [Opn->Dup]: Support comparing DateInterval objects

Edit report at https://bugs.php.net/bug.php?id=70381&edit=1

 ID:                 70381
 Updated by:         [email protected]
 Reported by:        accido at ukr dot net
 Summary:            Support comparing DateInterval objects
-Status:             Open
+Status:             Duplicate
 Type:               Feature/Change Request
 Package:            Date/time related
 Operating System:   Xubuntu 14
 PHP Version:        5.6.13RC1
 Block user comment: N
 Private report:     N

 New Comment:

I just became aware of request #49914.


Previous Comments:
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[2016-05-16 12:11:50] php dot net at anthonychambers dot co dot uk

I actually see this working back to 5.5.8 and up to 7.0.6 according to https://3v4l.org/TrPvp

The trick is that you have to inspect both intervals first. I just essentially did this:

var_export($interval1, true);
var_export($interval2, true);
var_export($interval1 < $interval2);

And that should work. If you don't check either of the intervals then you get different results:

* Check 0 = Always returns false
* Check 1 = Always returns true
* Check 2 = Returns correct values

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[2015-09-10 19:52:40] [email protected]

Ha, that's true. And it makes sense since it's not always possible to determine the number of days in an arbitrary interval. That could be a problem when trying to compare two DateIntervals in a general sense, though: what is P30D <=> P1M?

A better approach here would be to compare the start date + interval <=> end date.

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[2015-09-10 13:54:16] john_zuk at wp dot pl

You can't use ->days as a workaround, because of:
http://php.net/manual/en/class.dateinterval.php#dateinterval.props.days
See: https://3v4l.org/nlH2v

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[2015-08-28 11:45:43] [email protected]

DateIntervals are not comparable. You can use ->days as a workaround.

https://3v4l.org/H7JsN

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[2015-08-28 10:48:17] accido at ukr dot net

Description:
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Wrong DateInterval comparsion result

Test script:
---------------
$a = new DateTime('1981-10-10');
$b = new DateTime('1980-10-01');
$m = new DateInterval('P1M');
var_dump($a->diff($b) > $m);
//bool(false)




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Edit this bug report at https://bugs.php.net/bug.php?id=70381&edit=1