fix: `UseArrowFunctionsFixer` - don't convert lambda with `use($var)` clause if it includes another file by Copilot · Pull Request #9389 · PHP-CS-Fixer/PHP-CS-Fixer

Copilot · 2026-01-28T11:55:57Z

The use_arrow_functions rule incorrectly converts closures that capture variables via use() and include external files. Arrow functions don't support use() clauses, so captured variables are no longer exposed to the included file, changing runtime behavior.

// Before (incorrect): converted to arrow function
$load = function ($path) use ($container) {
    return include $path;  // $container accessible in included file
};

// After: preserved as closure
$load = function ($path) use ($container) {
    return include $path;  // $container still accessible in included file
};

Changes

Added containsIncludeOrRequire() to detect include/include_once/require/require_once tokens in return statements
Skip transformation when closure has both use() clause and include/require statement
Added test coverage for all four include/require variants and edge cases

Behavior

Conversion still occurs when:

Closure has no use() clause (included file doesn't need access to variables)
Closure has use() but no include/require (no file to expose variables to)

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

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- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/symfony/finder/zipball/ad4daa7c38668dcb031e63bc99ea9bd42196a2cb
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/symfony/options-resolver/zipball/b38026df55197f9e39a44f3215788edf83187b80
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/symfony/polyfill-ctype/zipball/a3cc8b044a6ea513310cbd48ef7333b384945638
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/symfony/polyfill-intl-grapheme/zipball/380872130d3a5dd3ace2f4010d95125fde5d5c70
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/symfony/polyfill-intl-normalizer/zipball/3833d7255cc303546435cb650316bff708a1c75c
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/symfony/polyfill-mbstring/zipball/6d857f4d76bd4b343eac26d6b539585d2bc56493
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/symfony/polyfill-php80/zipball/0cc9dd0f17f61d8131e7df6b84bd344899fe2608
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/symfony/polyfill-php81/zipball/4a4cfc2d253c21a5ad0e53071df248ed48c6ce5c
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/symfony/polyfill-php84/zipball/d8ced4d875142b6a7426000426b8abc631d6b191
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/symfony/polyfill-php85/zipball/d4e5fcd4ab3d998ab16c0db48e6cbb9a01993f91
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/symfony/process/zipball/608476f4604102976d687c483ac63a79ba18cc97
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/symfony/service-contracts/zipball/45112560a3ba2d715666a509a0bc9521d10b6c43
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/symfony/stopwatch/zipball/8a24af0a2e8a872fb745047180649b8418303084
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/symfony/string/zipball/1c4b10461bf2ec27537b5f36105337262f5f5d6f
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/symfony/var-dumper/zipball/0e4769b46a0c3c62390d124635ce59f66874b282
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/symfony/var-exporter/zipball/03a60f169c79a28513a78c967316fbc8bf17816f
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/symfony/yaml/zipball/24dd4de28d2e3988b311751ac49e684d783e2345
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/thecodingmachine/safe/zipball/2cdd579eeaa2e78e51c7509b50cc9fb89a956236
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/theofidry/cpu-core-counter/zipball/db9508f7b1474469d9d3c53b86f817e344732678
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/theseer/tokenizer/zipball/b7489ce515e168639d17feec34b8847c326b0b3c
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
https://api.github.com/repos/webmozarts/assert/zipball/ce6a2f100c404b2d32a1dd1270f9b59ad4f57649
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/JMmVee /usr/bin/composer install --no-interaction --quiet (http block)
salsa.debian.org
- Triggering command: /usr/bin/wget wget -q REDACTED --output-document=bin/checkbashisms remo�� add /https---github.com-guzzle-guzzle.git/ HP-CS-Fixer/vendor/guzzlehttp/guzzle REDACTED p-enum.git/ /https---github.--delta-base-offset git che/�� 3.0.5 -- /usr/local/.ghcu--all --no-checkout -coveralls.git or/sanmai/di-con-r git (dns block)
- Triggering command: /usr/bin/wget wget -q REDACTED --output-document=bin/checkbashisms chec�� v1.6.12 che/composer/vcs/https---github.com-php-coveralls-php-coveralls.--reference git e.git com-jsonrainbow-json-schema.git/remote che/composer/vcs/https---github.set-url git remo�� set-url 3cf04ad3 /home/REDACTED/.config/composer/vendor/bin/git REDACTED HP-CS-Fixer/phpu./vendor/bin/phpunit HP-CS-Fixer/vendtests/Fixer/FunctionNotation/UseArrowFunctionsFixerTest.php git (dns block)

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Original prompt

This section details on the original issue you should resolve

<issue_title>use_arrow_functions: change logic when callback includes external file</issue_title>
<issue_description>### Problem description

When callback includes file with include/include_once/require/require_once, and callback is explicitly using variables from outside of callback scope via use ($var) syntax, that $var is exposed transparenty to included file.
Converting such callback to arrow function removes this behaviour and effectively changing the outcome of the script.

use_arrow_functions rule (UseArrowFunctionsFixer class) shall not do conversion to arrow function for such cases

Detected in symfony/symfony@4e92c8b

Minimal reproducer CLI command

php-cs-fixer fix

Minimal reproducer code snippet
<?php

$load = \Closure::bind(static function ($path, $env) use ($container, $loader, $resource, $type) {
    return include $path;
}, null, null);
code shall not be modified , but is modified wrongly into:
$load = \Closure::bind(static fn ($path, $env) => include $path, null, null);
Fixer version

3.93

PHP version

8.5

How do you run Fixer?

Composer package

Contribution Checks

I have verified if this problem was already reported

I am familiar with "Feature or bug?"</issue_description>

<agent_instructions>Read the issue description. Create unit test in UseArrowFunctionsFixerTest.php file based on example from issue and fix the logic in UseArrowFunctionsFixer.php.

Ensure tests are executed properly afterwards, especially composer qa command. Ensure CI is green.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

Fixes use_arrow_functions: change logic when callback includes external file #9388

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

…e/require Co-authored-by: keradus <2716794+keradus@users.noreply.github.com>

coveralls · 2026-01-28T14:50:28Z

coverage: 92.942% (+0.001%) from 92.941%
when pulling c124c06 on copilot/fix-arrow-function-logic
into 9a10233 on master.

Initial plan

710a035

Copilot AI assigned Copilot and keradus Jan 28, 2026

Copilot started work on behalf of keradus January 28, 2026 11:56 View session

Fix use_arrow_functions to not convert closures with use() and includ…

266303b

…e/require Co-authored-by: keradus <2716794+keradus@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Fix logic in use_arrow_functions for external file callbacks~~ Fix use_arrow_functions: skip conversion when closure exposes variables to included files Jan 28, 2026

Copilot AI requested a review from keradus January 28, 2026 12:13

Copilot finished work on behalf of keradus January 28, 2026 12:13

keradus changed the title ~~Fix use_arrow_functions: skip conversion when closure exposes variables to included files~~ fix: UseArrowFunctionsFixer - don't convert lambdas with use($var) clause if it includes another file Jan 28, 2026

SCA

156e43e

keradus marked this pull request as ready for review January 28, 2026 23:19

CS

c124c06

keradus changed the title ~~fix: UseArrowFunctionsFixer - don't convert lambdas with use($var) clause if it includes another file~~ fix: UseArrowFunctionsFixer - don't convert lambda with use($var) clause if it includes another file Jan 28, 2026

keradus merged commit dc6bc0b into master Jan 28, 2026
32 of 33 checks passed

keradus deleted the copilot/fix-arrow-function-logic branch January 28, 2026 23:49

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fix: `UseArrowFunctionsFixer` - don't convert lambda with `use($var)` clause if it includes another file#9389

fix: `UseArrowFunctionsFixer` - don't convert lambda with `use($var)` clause if it includes another file#9389
keradus merged 4 commits intomasterfrom
copilot/fix-arrow-function-logic

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Copilot AI commented Jan 28, 2026 •

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