Reproduce autoloader bug #4003
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Reproduce autoloader bug #4003
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staabm
commented
May 21, 2025
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| spl_autoload_register(function($class) { | ||
| if ($class === \other12972\MyClass::class) { | ||
| throw new LogicException('this should not happen'); |
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in our real world project this autoloader is scanning some paths in the filesystem (similar to how a include-path worked in the past / or how the %PATH% variable works in a shell).
since it scans the filesystem it finds some files and includes them. this in turn leads to the problem described in phpstan/phpstan#12972 -> so invoking the autoloader leads side-effects, as files get included, which has impact on ReflectionClass->getFileName() invoked later on in PHPStan
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this test demonstrates how PHPStan analyzes code differently than it would happen at runtime.
runtime: run
php real-world.phpyou see the program runs, without the custom autoloader of
e2e/bug-12972b/autoloader.phpbeeing invoked.all involved classes are autoloaded by the composer class loader. the custom class loader is not invoked for
\other12972\MyClass::class.static analysis time: run
../../bin/phpstan analyzeyou see PHPStan invokes the custom class loader for class
\other12972\MyClass::class, which does not happen at regular runtime. the composer class loader is not invoked for\other12972\MyClass::class(like it is at runtime).because of the difference in autoloading functions order in runtime vs. analysis time we see errors which cannot happen at runtime - see phpstan/phpstan#12972