Bug #79104 [Asn]: Relative DateInterval Creates Infinite Loop
Edit report at https://bugs.php.net/bug.php?id=79104&edit=1
ID: 79104
User updated by: jimbo2150 at gmail dot com
Reported by: jimbo2150 at gmail dot com
Summary: Relative DateInterval Creates Infinite Loop
Status: Assigned
Type: Bug
Package: Date/time related
PHP Version: 7.3.13
Assigned To: derick
Block user comment: N
Private report: N
New Comment:
Not sure what you mean by the numbers you are looking for.
I got closer with this code (added "next year" to the DatePeriod object, but the result is
erratic (not sure what is being calculated):
$fmj = DateInterval::createFromDateString('first Monday of January next year');
$period = new DatePeriod(new DateTime('first Monday of January 2020'), $fmj, new
DateTime('2022-01-31'));
foreach ($period as $dt) {
var_dump($dt->format("l Y-m-d H:i:s"));
}
// Strange, incorrect output (not the first Monday of January 2021 or 2022):
string(26) "Monday 2020-01-06 00:00:00"
string(29) "Wednesday 2021-01-06 00:00:00"
string(27) "Tuesday 2022-01-04 00:00:00"
Previous Comments:
------------------------------------------------------------------------
[2020-01-19 11:04:57] a at b dot c dot de
Looks like it can't determine how long "first Monday of January" is.
echo $fmj->format('%y years, %m months, %d days, %h hours, %i minutes, %s seconds');
What numbers should it be using for those fields?
------------------------------------------------------------------------
[2020-01-11 21:42:39] jimbo2150 at gmail dot com
Description:
------------
A relative date format used in DateInterval produces and infinite loop when used with DatePeriod.
An example is looking for the first Monday in January of each year. When iterated via DatePeriod the
year will not get iterated and the correct relative date for current year keeps getting returned
creating an infinite loop.
Test script:
---------------
// Looking for every Monday of January each year
$fmj = DateInterval::createFromDateString('first Monday of January');
$period = new DatePeriod(new DateTime('2020-01-01'), $fmj, new
DateTime('2022-01-11'));
// Infinite loop, first Monday of January of current year keeps getting iterated
foreach ($period as $dt) {
var_dump($dt->format("l Y-m-d H:i:s"));
}
Expected result:
----------------
Return each first Monday of January for the next 2 years.
string(30) "Wednesday 2020-01-01 00:00:00"
string(27) "Monday 2020-01-06 00:00:00"
string(27) "Monday 2021-01-04 00:00:00"
string(27) "Monday 2022-01-03 00:00:00"
Actual result:
--------------
Infinite loop where each date is the first Monday of the current year's January.
string(30) "Wednesday 2020-01-01 00:00:00"
string(27) "Monday 2020-01-06 00:00:00"
string(27) "Monday 2020-01-06 00:00:00"
string(27) "Monday 2020-01-06 00:00:00"
string(27) "Monday 2020-01-06 00:00:00"
string(27) "Monday 2020-01-06 00:00:00"
string(27) "Monday 2020-01-06 00:00:00"
string(27) "Monday 2020-01-06 00:00:00"
string(27) "Monday 2020-01-06 00:00:00"
...
{infinite loop}
------------------------------------------------------------------------
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