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Bug #65672 Broken classes inherited from DatePeriod
Submitted: 2013-09-14 01:32 UTC Modified: 2018-10-02 10:51 UTC
Avg. Score:4.2 ± 1.3
Reproduced:16 of 18 (88.9%)
Same Version:6 (37.5%)
Same OS:11 (68.8%)
From: hosiplan at gmail dot com Assigned:
Status: Verified Package: Date/time related
PHP Version: 7.1 OS: Linux
Private report: No CVE-ID: None
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 [2013-09-14 01:32 UTC] hosiplan at gmail dot com
From manual page:

Classes inherited from DatePeriod class cannot use their declared properties

Test script:

class Period extends \DatePeriod
	public $test;

$p = new Period(new \DateTime('now'), new \DateInterval('P1Y'), new \DateTime('tomorrow'));
$p->test = FALSE;

Expected result:
no error

Actual result:
Fatal error: main(): Writing to DatePeriod properties is unsupported in 
period.phpt on line 9


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 [2014-06-29 14:44 UTC] info at vdespa dot de
I can confirm this bug. It seems to introduce a backward incompatibility and it seems not to be properly documented in the changelog.

Looks like trying to fix bug #53437 (Crash when using unserialized DatePeriod instance) generated this issue. (
 [2017-01-16 06:58 UTC]
-PHP Version: 5.5.3 +PHP Version: 7.1
 [2017-01-16 06:58 UTC]
Looks like this never actually worked[1], so it can't have been introduced by a bugfix…

 [2018-02-17 21:47 UTC] php at duncanc dot co dot uk
It looks like this was introduced in 5.3.27 / 5.4.17 when fixing bug 53437 (
 [2018-10-02 10:51 UTC]
-Status: Open +Status: Verified
 [2018-10-02 10:51 UTC]
I can confirm that this BC break has been introduced with commit

[1] <;a=commit;h=0ee71557ffd285552659b6aa37ea236e3bad493f>
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