Bug #72174 [Com]: ReflectionProperty#getValue() causes __isset call

Edit report at https://bugs.php.net/bug.php?id=72174&edit=1 ID: 72174 Comment by: ocramius at gmail dot com Reported by: ocramius at gmail dot com Summary: ReflectionProperty#getValue() causes __isset call Status: Closed Type: Bug Package: Reflection related PHP Version: 7.0.6 Block user comment: N Private report: N New Comment: Looks good from here! Related tests seem to pass on 7.0.7-DEV :beer: Previous Comments: ------------------------------------------------------------------------ [2016-05-10 10:18:29] nikic@php.net Automatic comment on behalf of nikic Revision: http://git.php.net/?p=php-src.git;a=commit;h=a1ed4ab3caf33b59742897b43462d033864bb490 Log: Fixed bug #72174 ------------------------------------------------------------------------ [2016-05-07 19:00:31] ocramius at gmail dot com As per discussion with NikiC and bwoebi in http://chat.stackoverflow.com/transcript/message/30402977#30402977 There has been an ever-living bug in ReflectionProperty#getValue() that causes the reflection property to be read (and return NULL) even when not set, and that without causing a warning. That can be seen at https://3v4l.org/vdOjh Code below as reference: ```php <?php class Foo { public $bar; } $instance = new Foo; unset($instance->bar); var_dump((new ReflectionProperty(Foo::class, 'bar'))->getValue($instance)); ``` This code always returns NULL, but it should raise a NOTICE. PHP 7.0.6 somehow mitigates the bug by doing an implicit isset() check internally, but that changes behavior of ReflectionProperty#getValue() in such a way that it breaks some userland existing code ( https://github.com/Ocramius/ProxyManager/issues/306 - possibly also other codebases) by causing __isset calls. Making ReflectionProperty#getValue() trigger a notice when a property IS_UNDEF could probably be a good solution. ------------------------------------------------------------------------ [2016-05-07 18:59:54] nikic@php.net To summarize OTR discussion: The issue is that ReflectionProperty::getValue() currently performs a "silenced read", which is roughly equivalent to doing isset($obj->prop) ? $obj->prop : NULL. Prior to PHP 7.0.6 the isset($obj->prop) part did not result in a call to __isset() due to a bug in the magic method implementation. However, it can be be argued that ReflectionProperty::getValue() should not be performing a silenced read in the first place. It should simply return the value of $obj->prop. If we make this change then the behavior described in the bug report will go back to what it was. On the other hand, this means that using ReflectionProperty::getValue() to read an undefined property will throw an undefined property notice (currently suppressed: https://3v4l.org/vdOjh). The current plan is to change ReflectionProperty::getValue() to perform the read without silencing. ------------------------------------------------------------------------ [2016-05-07 18:48:57] ocramius at gmail dot com Bug seems to really only affect reflection access: https://3v4l.org/GY4NC ------------------------------------------------------------------------ [2016-05-07 18:27:36] ocramius at gmail dot com Note: bug was discovered in builds of ProxyManager at https://travis-ci.org/Ocramius/ProxyManager/jobs/128480921#L384 ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=72174 -- Edit this bug report at https://bugs.php.net/bug.php?id=72174&edit=1