phpcompatibility/phpcompatibility-symfony

A set of rulesets for PHP_CodeSniffer to check for PHP cross-version compatibility issues in projects, while accounting for polyfills provided by the Symfony polyfill libraries.

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Type:phpcodesniffer-standard

pkg:composer/phpcompatibility/phpcompatibility-symfony

2.0.0-alpha1 2025-10-22 16:25 UTC

README

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Using PHPCompatibilitySymfony, you can analyse the codebase of a project using any of the Symfony polyfill libraries, for PHP cross-version compatibility.

What's in this repo ?

A set of rulesets for PHP_CodeSniffer to check for PHP cross-version compatibility issues in projects, while accounting for polyfills provided by the Symfony polyfill libraries.

These rulesets prevent false positives from the PHPCompatibility standard by excluding back-fills and polyfills which are provided by those libraries.

Symfony Polyfill Library Corresponding PHPCompatibility Ruleset Includes
polyfill-php54 PHPCompatibilitySymfonyPolyfillPHP54
polyfill-php55 PHPCompatibilitySymfonyPolyfillPHP55 PHPCompatibilityPasswordCompat
polyfill-php56 PHPCompatibilitySymfonyPolyfillPHP56
polyfill-php70 PHPCompatibilitySymfonyPolyfillPHP70 PHPCompatibilityParagonieRandomCompat
polyfill-php71 PHPCompatibilitySymfonyPolyfillPHP71
polyfill-php72 PHPCompatibilitySymfonyPolyfillPHP72
polyfill-php73 PHPCompatibilitySymfonyPolyfillPHP73
polyfill-php74 PHPCompatibilitySymfonyPolyfillPHP74
polyfill-php80 PHPCompatibilitySymfonyPolyfillPHP80
polyfill-php81 PHPCompatibilitySymfonyPolyfillPHP81
polyfill-php82 PHPCompatibilitySymfonyPolyfillPHP82
polyfill-php83 PHPCompatibilitySymfonyPolyfillPHP83
polyfill-php84 PHPCompatibilitySymfonyPolyfillPHP84
polyfill-php85 PHPCompatibilitySymfonyPolyfillPHP85

Note

About "Includes":
Some polyfills have other polyfills as dependencies. If the PHPCompatibility project offers a dedicated ruleset for the polyfill dependency, that ruleset will be included in the ruleset for the higher level polyfill.

For example:
As the polyfill-php70 library declares random_compat as a dependency, the PHPCompatibilitySymfonyPolyfillPHP70 ruleset includes the PHPCompatibilityParagonieRandomCompat ruleset.

In practice, this means that if your project uses several polyfills, you can use the information in "Includes" to help you decide which rulesets to use.

Funding

This project needs funding.

The project team has spend thousands of hours creating and maintaining the PHPCompatibility packages. This is unsustainable without funding.

If you use PHPCompatibility, please fund this work by setting up a monthly contribution to the PHP_CodeSniffer Open Collective.

Requirements

Installation instructions

The only supported installation method is via Composer.

Composer will automatically install the project dependencies and register the external rulesets with PHP_CodeSniffer using the Composer PHPCS plugin.

Run the following from the root of your project:

composer config allow-plugins.dealerdirect/phpcodesniffer-composer-installer true
composer require --dev phpcompatibility/phpcompatibility-symfony:"^2.0@dev"

Next, run:

vendor/bin/phpcs -i

If all went well, you will now see that the PHPCompatibility and a range of PHPCompatibilitySymfony and other PHPCompatibility standards are installed for PHP_CodeSniffer.

Upgrade instructions

To upgrade this package, run the following command:

composer update --dev phpcompatibility/phpcompatibility-symfony --with-dependencies

Tip

If you have a root requirement in your project for one of the packages used by this project, you may need to update with --with-all-dependencies instead.

How to use

You can now use the following commands to inspect the code in your project for PHP cross-version compatibility:

vendor/bin/phpcs -p . --standard=PHPCompatibilitySymfonyPolyfillPHP54
vendor/bin/phpcs -p . --standard=PHPCompatibilitySymfonyPolyfillPHP55
vendor/bin/phpcs -p . --standard=PHPCompatibilitySymfonyPolyfillPHP56
vendor/bin/phpcs -p . --standard=PHPCompatibilitySymfonyPolyfillPHP70
vendor/bin/phpcs -p . --standard=PHPCompatibilitySymfonyPolyfillPHP71
vendor/bin/phpcs -p . --standard=PHPCompatibilitySymfonyPolyfillPHP72
vendor/bin/phpcs -p . --standard=PHPCompatibilitySymfonyPolyfillPHP73
vendor/bin/phpcs -p . --standard=PHPCompatibilitySymfonyPolyfillPHP74
vendor/bin/phpcs -p . --standard=PHPCompatibilitySymfonyPolyfillPHP80
vendor/bin/phpcs -p . --standard=PHPCompatibilitySymfonyPolyfillPHP81
vendor/bin/phpcs -p . --standard=PHPCompatibilitySymfonyPolyfillPHP82
vendor/bin/phpcs -p . --standard=PHPCompatibilitySymfonyPolyfillPHP83
vendor/bin/phpcs -p . --standard=PHPCompatibilitySymfonyPolyfillPHP84
vendor/bin/phpcs -p . --standard=PHPCompatibilitySymfonyPolyfillPHP85

# You can also combine the standards if your project uses several:
vendor/bin/phpcs -p . --standard=PHPCompatibilitySymfonyPolyfillPHP55,PHPCompatibilitySymfonyPolyfillPHP70,PHPCompatibilitySymfonyPolyfillPHP73

By default, you will only receive notifications about deprecated and/or removed PHP features.

To get the most out of the PHPCompatibilitySymfony rulesets, you should specify a testVersion to check against. That will enable the checks for both deprecated/removed PHP features as well as the detection of code using new PHP features.

For example:

# For a project which should be compatible with PHP 5.3 up to and including PHP 7.0:
vendor/bin/phpcs -p . --standard=PHPCompatibilitySymfonyPolyfillPHP56 --runtime-set testVersion 5.3-7.0

# For a project which should be compatible with PHP 7.2 and higher:
vendor/bin/phpcs -p . --standard=PHPCompatibilitySymfonyPolyfillPHP73 --runtime-set testVersion 7.2-

For more detailed information about setting the testVersion, see the README of the generic PHPCompatibility(PHPCompatibility-testVersion standard.

Testing PHP files only

By default PHP_CodeSniffer < 4.0 will analyse PHP, JavaScript and CSS files. As the PHPCompatibility sniffs only target PHP code, you can make the run slightly faster by telling PHP_CodeSniffer to only check PHP files, like so:

vendor/bin/phpcs -p . --standard=PHPCompatibilitySymfonyPolyfillPHP71 --extensions=php --runtime-set testVersion 5.3-

License

All code within the PHPCompatibility organisation is released under the GNU Lesser General Public License (LGPL). For more information, visit https://www.gnu.org/licenses/lgpl-3.0.html.