Doc #77202 [Opn->Csd]: DateInterval compare unpredictable result
Edit report at https://bugs.php.net/bug.php?id=77202&edit=1
ID: 77202
Updated by: derick@php.net
Reported by: thomas dot wanka at gmx dot net
Summary: DateInterval compare unpredictable result
-Status: Open
+Status: Closed
Type: Documentation Problem
Package: Date/time related
Operating System: Linux
PHP Version: 7.2.12
-Assigned To:
+Assigned To: derick
Block user comment: N
Private report: N
New Comment:
Thank you for your bug report. This issue has already been fixed
in the latest released version of PHP, which you can download at
http://www.php.net/downloads.php
This was addressed in PHP 7.4, where the script (After fixing syntax), now shows:
Warning: Cannot compare DateInterval objects in Standard input code on line 11
Previous Comments:
------------------------------------------------------------------------
[2018-12-04 23:04:14] a at b dot c dot de
See also Bug #74940
------------------------------------------------------------------------
[2018-11-26 11:23:37] a at b dot c dot de
Where did you read that > could be used to compare objects in the first place?
What does happen is that if you do a debugging dump of a DateTime object it creates a bunch of
additional properties.
<?php
$old = DateTime::createFromFormat('Y-m-d H:i:s', '2018-11-26 09:29:00');
$now = new DateTime('now',new DateTimeZone('Europe/Berlin'));
$actualDiff = $now->diff($old);
echo "Weekday: ", $actualDiff->weekday;
echo "\n";
print_r($actualDiff);
echo "\n";
echo "Weekday: ", $actualDiff->weekday;
------------------------------------------------------------------------
[2018-11-26 08:53:54] thomas dot wanka at gmx dot net
Description:
------------
The result if compare operator on two DateInterval objects is unpredictable.
See code in the "test script" section:
the result of the if() statement depends on the code before. If, for instance, you print the
DateInterval, the internal structure seems to change, and the result is correct. Otherwise, the
result is not correct. The system should output an error or a warning if the compare operater is not
fully implemented.
Test script:
---------------
<?php
$old = DateTime::createFromFormat('Y-m-d H:i:s', '2018-11-26 09:29:00');
// constant here for demo only, i read datetime field from database
$now = new DateTime('now',new DateTimeZone('Europe/Berlin'));
$maxdiff = new DateInterval('PT30M');
$actualDiff = $now->diff($old);
// echo "<pre>"; print_r($now); echo "</pre><br />";
// echo "<pre>"; print_r($maxdiff ); echo "</pre><br />";
if ($actualDiff>$maxDiff) echo "time is up" else echo "just wait";
?>
Expected result:
----------------
throw an error if an nvalid operator ist used
minimum request: add information about this behauviour into documentation of DateInterval
Actual result:
--------------
operator is performed, result is unpredictable
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=77202&edit=1
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