Bug #77291 [Opn->Ana]: __isset() magic method doesn't work if implemented via a trait.

Edit report at https://bugs.php.net/bug.php?id=77291&edit=1 ID: 77291 Updated by: cmb@php.net Reported by: tandrewbennett at hotmail dot com Summary: __isset() magic method doesn't work if implemented via a trait. -Status: Open +Status: Analyzed Type: Bug Package: *General Issues Operating System: Ubuntu 16.04 PHP Version: 7.3.0 -Assigned To: +Assigned To: cmb Block user comment: N Private report: N New Comment: Thanks for reporting this issue, and for providing a simple reproducer! This regression has been introduced with commit 43aca31[1]. It is not particularly related to namespaces, and does not only affect __isset(), but rather all magic methods which are inherited from a trait, whose name has the same length as the class name, see, for instance, <https://3v4l.org/0jmp1>. Previous Comments: ------------------------------------------------------------------------ [2018-12-14 00:34:47] tandrewbennett at hotmail dot com Also, here is an updated version from 3v4l.org (wrapping in namespaces triggers the error) if you don't want to clone down the demo repo I created. https://3v4l.org/rSfeG ------------------------------------------------------------------------ [2018-12-13 23:32:30] tandrewbennett at hotmail dot com So this seems to go beyond the scope of what I originally thought. I think this is somehow related to autoloading (but I'm not quite sure). I've created a sample app to reproduce the error: git clone git@github.com:tabennett/php-7.3.0-error.git CD into the app composer install vendor/bin/phpunit If you rename Foo to a class that has two words (e.g FooBar) this error goes away! Alternatively, if you set the PSR-4 namespace in composer.json to something with two words it also goes away. ------------------------------------------------------------------------ [2018-12-13 09:31:04] danack@php.net This appears to work for me on PHP 7.3.0 https://3v4l.org/i9Lpv Please can you try with OPCache disabled, and/or disabling any non-core extensions you have enabled? ------------------------------------------------------------------------ [2018-12-13 07:10:11] tandrewbennett at hotmail dot com Description: ------------ The __isset() magic method is no longer invoked on a class if implemented via a Trait. Test script: --------------- trait AccessibleProperties { public function __isset($property) { return property_exists($this, $property); } public function __get($property) { if (property_exists($this, $property)) { return $this->$property; } } } class Foo { use AccessibleProperties; protected $a = 'Some value'; } $foo = new Foo; $foo->a; // this works: returns 'Some value' isset($foo->a); // this doesn't work: returns false ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=77291&edit=1