Bug #81147 [Com]: getDefaultValue() throws if a mandatory parameter follows

Edit report at https://bugs.php.net/bug.php?id=81147&edit=1 ID: 81147 Comment by: gdgdgd at dhdhr dot hh Reported by: me at derrabus dot de Summary: getDefaultValue() throws if a mandatory parameter follows Status: Open Type: Bug Package: Documentation problem Operating System: macOS 11.4, Ubuntu 20.04 PHP Version: 8.1.0alpha1 Block user comment: N Private report: N New Comment: optional parameters before mandatory ones don't make sense at all Previous Comments: ------------------------------------------------------------------------ [2021-06-16 18:18:37] krakjoe@php.net Because the parameter is implicitly nullable, no deprecation warning in shown in this case. However the behaviour does not change, and the deprecation warning reads: > Optional parameter $arg1 declared before required parameter $arg2 is implicitly treated as a > required parameter In other words, the default value is ignored, and the engine generates ZEND_RECV not RECV_INIT, leading to internal error in Reflection. There's nothing to fix here, but this should be documented. ------------------------------------------------------------------------ [2021-06-16 18:02:37] me at derrabus dot de Description: ------------ If I reflect on a function that has an optional parameter before a mandatory one and I try to fetch the default value of the optional parameter, a ReflectionException is raised. This was not the case on PHP 8.0 and earlier. I am unsure if this is an intentional change because specifying a function where a mandatory parameter follows an optional one had already been deprecated in PHP 8.0. But I somewhat expected that the deprecation would not be turned into an error before PHP 9. Test script: --------------- <?php function myFunctionA(object $arg1 = null) { } function myFunctionB(object $arg1 = null, $arg2) { } var_dump((new ReflectionParameter('myFunctionA', 0))->getDefaultValue()); var_dump((new ReflectionParameter('myFunctionB', 0))->getDefaultValue()); Expected result: ---------------- NULL NULL Actual result: -------------- NULL Fatal error: Uncaught ReflectionException: Internal error: Failed to retrieve the default value ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=81147&edit=1