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Bug #82016 usage of +- in strtotime results in unexpected output with PHP8.2
Submitted: 2023-07-27 08:26 UTC Modified: 2023-07-27 11:14 UTC
From: hallo at davidgreiner dot de Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 8.2.8 OS:
Private report: No CVE-ID: None
 [2023-07-27 08:26 UTC] hallo at davidgreiner dot de
Description:
------------
Hello!

In case of strtotime is used with '+- <date/time-string>' the output differs with PHP8.2 compared to PHP8.1 

In my opionion - depending on the usage and codebase - this COULD be a security risk, thats why i am posting this here and not in the public bug tracker in github. 

Test script:
---------------
<?php

$foo = strtotime('+-2 hours');
$bar = strtotime('-2 hours');

echo '+-2 hours equals -2 hours = ' . ($foo === $bar ? 'yes' : 'no') . PHP_EOL;



Expected result:
----------------
OUTPUT with PHP8.1: +-2 hours equals -2 hours = yes

Actual result:
--------------
OUTPUT with PHP8.2: +-2 hours equals -2 hours = no

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 [2023-07-27 11:13 UTC] derick@php.net
-Status: Open +Status: Not a bug -Type: Security +Type: Bug -Package: *General Issues +Package: Date/time related
 [2023-07-27 11:13 UTC] derick@php.net
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

This issue comes nowhere close to the requirements for this being classed as a security. As a matter of fact, this change is documented in the PHP 8.2 migration guide: https://www.php.net/manual/en/migration82.incompatible.php
 
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