Doc #67034 [Ver]: Unable to compare DatePeriod instances with == operator

Edit report at https://bugs.php.net/bug.php?id=67034&edit=1 ID: 67034 Updated by: derick@php.net Reported by: from dot php dot net at brainbox dot cz Summary: Unable to compare DatePeriod instances with == operator Status: Verified Type: Documentation Problem Package: Date/time related PHP Version: 5.6.0alpha3 Block user comment: N Private report: N New Comment: Where would we document this CMB? Previous Comments: ------------------------------------------------------------------------ [2021-02-26 21:50:51] cmb@php.net DatePeriod comparision are explicitly disallowed (and as such return false) as of PHP 7.4.0, for the reasons outlined above. This is apparently not yet documented, though. ------------------------------------------------------------------------ [2014-12-08 17:30:47] mfaust at usinternet dot com Comparisons of DatePeriod really ins't feasible without knowing a start date. For example 'P1M' and 'P30D' are equal (==) for some months, but not others. The == comparison is possible for time-only date periods but for anything involving dates you can't make a reliable assumption. My recommendation is to return TRUE when all the parts patch exactly (eg 'PT60S' == 'PT60S' but 'PT1M' != 'PT60S') just to make the behavior consistent if a date portion is involved. If you want a true comparison then do something like this: $now = new DateTimeImmutable(); if($now->addInterval($intervalA) == $now->addInterval($intervalB)){... (note that DateTimeImmutable will return a new object for each instead of modifying $now) ------------------------------------------------------------------------ [2014-04-06 12:16:53] from dot php dot net at brainbox dot cz Description: ------------ I am unable to compare DatePeriod timezones with equality operator. The operator always returns true regardless the DatePeriod value. Result can be seen here: http://3v4l.org/b8AAS Test script: --------------- // different var_dump(new DateInterval('PT1S') == new DateInterval('PT2S')); // same var_dump(new DateInterval('PT1S') == new DateInterval('PT1S')); Expected result: ---------------- bool(false) bool(true) Actual result: -------------- bool(true) bool(true) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=67034&edit=1