Bug->Doc #76588 [Opn->Ver]: var_export change variable state

Edit report at https://bugs.php.net/bug.php?id=76588&edit=1 ID: 76588 Updated by: cmb@php.net Reported by: sukei13 at gmail dot com Summary: var_export change variable state -Status: Open +Status: Verified -Type: Bug +Type: Documentation Problem Package: Date/time related PHP Version: Irrelevant Block user comment: N Private report: N New Comment: Comparing DateInterval instances cannot be well defined (consider e.g. P1M and P30D); as of PHP 7.4.0, comparisons raise a warning and evaluate to FALSE. Prior to that version, their behavior was, let's say, undefined. While that change is noted in the migration guide[1], it is not yet documented in the manual proper (not sure, *where* this should be documented). [1] <https://www.php.net/manual/en/migration74.incompatible.php#migration74.incompatible.datetime> Previous Comments: ------------------------------------------------------------------------ [2018-07-06 13:37:46] sukei13 at gmail dot com Doing further tests, it appears that the print_r function has the same behavior as var_export. ------------------------------------------------------------------------ [2018-07-06 13:30:04] sukei13 at gmail dot com Description: ------------ The result of a comparison (soft: ==) between two date intervals change when the variable has been exported (var_export) earlier. The var_export function affect the internal state of the DateInterval object in some way. The following test script show this weird behavior. Note that this test has been made on other objects too (such as DateTime or DateTimeImmutable) but DateInterval seems to be the only object involved in this issue. Test script: --------------- <?php $a = new DateInterval('P2Y4DT6H8M'); $b = new DateInterval('P2Y4DT6H8M'); var_dump($a == $b); // true var_export($b, true); var_dump($a == $b); // false Expected result: ---------------- bool(true) bool(true) Actual result: -------------- bool(true) bool(false) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=76588&edit=1