Internal error: preg_match(): Argument #2 ($subject) must be of type string, array given

[GameCharmer]

Bug report

Using PHPStan 1.9.3 on a gitlab-ci worker. I can execute this fine locally, but on remote it fails with the following backtrace.

Code snippet that reproduces the problem

Internal error: Internal error: preg_match(): Argument #2 ($subject) must be of type string, array given in file /home/gitlab-runner/builds/[REDACTED]/MongoIndexHandler.php

Post the following stack trace to https://github.com/phpstan/phpstan/issues/new?template=Bug_report.md: 
#0 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/vendor/symfony/polyfill-mbstring/Mbstring.php(440): preg_match()
#1 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/vendor/symfony/polyfill-mbstring/Mbstring.php(416): Symfony\\Polyfill\\Mbstring\\Mbstring::mb_detect_encoding()
#2 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/vendor/symfony/polyfill-mbstring/bootstrap80.php(45): Symfony\\Polyfill\\Mbstring\\Mbstring::mb_check_encoding()
#3 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Type/Php/StrCaseFunctionsReturnTypeExtension.php(66): mb_check_encoding()
#4 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/MutatingScope.php(1506): PHPStan\\Type\\Php\\StrCaseFunctionsReturnTypeExtension->getTypeFromFunctionCall()
#5 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/MutatingScope.php(559): PHPStan\\Analyser\\MutatingScope->resolveType()
#6 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(2344): PHPStan\\Analyser\\MutatingScope->getType()
#7 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(1543): PHPStan\\Analyser\\NodeScopeResolver->getFunctionThrowPoint()
#8 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(1984): PHPStan\\Analyser\\NodeScopeResolver->processExprNode()
#9 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(1980): PHPStan\\Analyser\\NodeScopeResolver->processExprNode()
#10 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(1929): PHPStan\\Analyser\\NodeScopeResolver->processExprNode()
#11 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(1914): PHPStan\\Analyser\\NodeScopeResolver->processExprNode()
#12 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(2743): PHPStan\\Analyser\\NodeScopeResolver->processExprNode()
#13 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(1691): PHPStan\\Analyser\\NodeScopeResolver->processArgs()
#14 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(558): PHPStan\\Analyser\\NodeScopeResolver->processExprNode()
#15 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(360): PHPStan\\Analyser\\NodeScopeResolver->processStmtNode()
#16 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(723): PHPStan\\Analyser\\NodeScopeResolver->processStmtNodes()
#17 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(360): PHPStan\\Analyser\\NodeScopeResolver->processStmtNode()
#18 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(521): PHPStan\\Analyser\\NodeScopeResolver->processStmtNodes()
#19 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(360): PHPStan\\Analyser\\NodeScopeResolver->processStmtNode()
#20 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(599): PHPStan\\Analyser\\NodeScopeResolver->processStmtNodes()
#21 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(360): PHPStan\\Analyser\\NodeScopeResolver->processStmtNode()
#22 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(571): PHPStan\\Analyser\\NodeScopeResolver->processStmtNodes()
#23 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(327): PHPStan\\Analyser\\NodeScopeResolver->processStmtNode()
#24 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/FileAnalyser.php(175): PHPStan\\Analyser\\NodeScopeResolver->processNodes()
#25 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Command/WorkerCommand.php(147): PHPStan\\Analyser\\FileAnalyser->analyseFile()
#26 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/vendor/evenement/evenement/src/Evenement/EventEmitterTrait.php(97): PHPStan\\Command\\WorkerCommand->PHPStan\\Command\\{closure}()
#27 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/vendor/clue/ndjson-react/src/Decoder.php(110): _PHPStan_0f7d3d695\\Evenement\\EventEmitter->emit()
#28 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/vendor/evenement/evenement/src/Evenement/EventEmitterTrait.php(97): _PHPStan_0f7d3d695\\Clue\\React\\NDJson\\Decoder->handleData()
#29 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/vendor/react/stream/src/Util.php(62): _PHPStan_0f7d3d695\\Evenement\\EventEmitter->emit()
#30 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/vendor/evenement/evenement/src/Evenement/EventEmitterTrait.php(97): _PHPStan_0f7d3d695\\React\\Stream\\Util::_PHPStan_0f7d3d695\\React\\Stream\\{closure}()
#31 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/vendor/react/stream/src/DuplexResourceStream.php(154): _PHPStan_0f7d3d695\\Evenement\\EventEmitter->emit()
#32 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/vendor/react/event-loop/src/StreamSelectLoop.php(201): _PHPStan_0f7d3d695\\React\\Stream\\DuplexResourceStream->handleData()
#33 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/vendor/react/event-loop/src/StreamSelectLoop.php(173): _PHPStan_0f7d3d695\\React\\EventLoop\\StreamSelectLoop->waitForStreamActivity()
#34 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/src/Command/WorkerCommand.php(107): _PHPStan_0f7d3d695\\React\\EventLoop\\StreamSelectLoop->run()
#35 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/vendor/symfony/console/Command/Command.php(259): PHPStan\\Command\\WorkerCommand->execute()
#36 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/vendor/symfony/console/Application.php(868): _PHPStan_0f7d3d695\\Symfony\\Component\\Console\\Command\\Command->run()
#37 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/vendor/symfony/console/Application.php(259): _PHPStan_0f7d3d695\\Symfony\\Component\\Console\\Application->doRunCommand()
#38 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/vendor/symfony/console/Application.php(157): _PHPStan_0f7d3d695\\Symfony\\Component\\Console\\Application->doRun()
#39 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/bin/phpstan(124): _PHPStan_0f7d3d695\\Symfony\\Component\\Console\\Application->run()
#40 phar:///home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan.phar/bin/phpstan(125): _PHPStan_0f7d3d695\\{closure}()
#41 /home/gitlab-runner/builds/[REDACTED]/vendor/phpstan/phpstan/phpstan(8): require('...')
#42 /home/gitlab-runner/builds/[REDACTED]/vendor/bin/phpstan(117): include('...')
#43 {main}",

Expected output

This might be due to typecasting some mongodb output as a string, but I can't confirm.

Did PHPStan help you today? Did it make you happy in any way?

PHPStan is AWESOME! :D

Edit: Shortened up the file paths

[mergeable]

This bug report is missing a link to reproduction at phpstan.org/try.

It will most likely be closed after manual review.

[ondrejmirtes]

Can you please provide a piece of code that makes PHPStan crash like this? So ideally, run with --debug, see which file causes it, try to make the file smaller and smaller until only the crashing piece of code remains. Thank you!

[eigan]

Some of our devs experience the same issue. We found the line and was able to reproduce when the file contained only this particular code.

Have tried to delete cache in /tmp/phpstan*

<?php

echo sprintf('Section: %s%s', strtoupper("Something"), PHP_EOL);

Replacing strtoupper with hardcoded string "solves" the crash.

-- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Error
-- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Internal error: Internal error: preg_match(): Argument #2 ($subject) must be of type string, array given in file [file.php]

Post the following stack trace to https://github.com/phpstan/phpstan/issues/new?template=Bug_report.md:
#0 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/vendor/symfony/polyfill-mbstring/Mbstring.php(440): preg_match()
#1 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/vendor/symfony/polyfill-mbstring/Mbstring.php(416):
Symfony\Polyfill\Mbstring\Mbstring::mb_detect_encoding()
#2 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/vendor/symfony/polyfill-mbstring/bootstrap80.php(45):
Symfony\Polyfill\Mbstring\Mbstring::mb_check_encoding()
#3 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/src/Type/Php/StrCaseFunctionsReturnTypeExtension.php(66): mb_check_encoding()
#4 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/MutatingScope.php(1505):
PHPStan\Type\Php\StrCaseFunctionsReturnTypeExtension->getTypeFromFunctionCall()
#5 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/MutatingScope.php(557): PHPStan\Analyser\MutatingScope->resolveType()
#6 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/MutatingScope.php(778): PHPStan\Analyser\MutatingScope->getType()
#7 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/MutatingScope.php(557): PHPStan\Analyser\MutatingScope->resolveType()
#8 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(1437): PHPStan\Analyser\MutatingScope->getType()
#9 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(554): PHPStan\Analyser\NodeScopeResolver->findEarlyTerminatingExpr()
#10 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/NodeScopeResolver.php(327): PHPStan\Analyser\NodeScopeResolver->processStmtNode()
#11 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/src/Analyser/FileAnalyser.php(175): PHPStan\Analyser\NodeScopeResolver->processNodes()
#12 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/src/Command/WorkerCommand.php(147): PHPStan\Analyser\FileAnalyser->analyseFile()
#13 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/vendor/evenement/evenement/src/Evenement/EventEmitterTrait.php(97):
PHPStan\Command\WorkerCommand->PHPStan\Command\{closure}()
#14 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/vendor/clue/ndjson-react/src/Decoder.php(110): _PHPStan_582a9cb8b\Evenement\EventEmitter->emit()
#15 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/vendor/evenement/evenement/src/Evenement/EventEmitterTrait.php(97):
_PHPStan_582a9cb8b\Clue\React\NDJson\Decoder->handleData()
#16 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/vendor/react/stream/src/Util.php(62): _PHPStan_582a9cb8b\Evenement\EventEmitter->emit()
#17 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/vendor/evenement/evenement/src/Evenement/EventEmitterTrait.php(97):
_PHPStan_582a9cb8b\React\Stream\Util::_PHPStan_582a9cb8b\React\Stream\{closure}()
#18 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/vendor/react/stream/src/DuplexResourceStream.php(154):
_PHPStan_582a9cb8b\Evenement\EventEmitter->emit()
#19 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/vendor/react/event-loop/src/StreamSelectLoop.php(201):
_PHPStan_582a9cb8b\React\Stream\DuplexResourceStream->handleData()
#20 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/vendor/react/event-loop/src/StreamSelectLoop.php(173):
_PHPStan_582a9cb8b\React\EventLoop\StreamSelectLoop->waitForStreamActivity()
#21 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/src/Command/WorkerCommand.php(107): _PHPStan_582a9cb8b\React\EventLoop\StreamSelectLoop->run()
#22 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/vendor/symfony/console/Command/Command.php(259): PHPStan\Command\WorkerCommand->execute()
#23 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/vendor/symfony/console/Application.php(868):
_PHPStan_582a9cb8b\Symfony\Component\Console\Command\Command->run()
#24 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/vendor/symfony/console/Application.php(259):
_PHPStan_582a9cb8b\Symfony\Component\Console\Application->doRunCommand()
#25 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/vendor/symfony/console/Application.php(157):
_PHPStan_582a9cb8b\Symfony\Component\Console\Application->doRun()
#26 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/bin/phpstan(124): _PHPStan_582a9cb8b\Symfony\Component\Console\Application->run()
#27 phar://[snip]/vendor/phpstan/phpstan/phpstan.phar/bin/phpstan(125): _PHPStan_582a9cb8b\{closure}()
#28 [snip]/vendor/phpstan/phpstan/phpstan.phar(6): require('...')
#29 [snip]/vendor/bin/phpstan.phar(120): include('...')
#30 {main}
Child process error (exit code 1):   

[ondrejmirtes]

Reported: symfony/polyfill#422

[ondrejmirtes]

I can execute this fine locally

If you install mbstring PHP extension in GitLab CI, it's gonna work for you too :)

[ondrejmirtes]

Should be fixed: phpstan/phpstan-src@dfcaa30

Please test this on PHPStan 1.10.33.

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.