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PHPCompatibility/PHPCompatibility: PHP Compatibility check for PHP_CodeSniffer

This is a set of sniffs for PHP CodeSniffer that checks for PHP cross-version compatibility. It will allow you to analyse your code for compatibility with higher and lower versions of PHP.

• PHP Version Support
• Requirements
• Thank you
• Upgrading to PHPCompatibility 9.0.0
• Installation in a Composer project (method 1)
• Installation via a git check-out to an arbitrary directory (method 2)
• Sniffing your code for compatibility with specific PHP version(s)
  • Using a framework/CMS/polyfill specific ruleset
• Using a custom ruleset
  • testVersion in the ruleset versus command-line
  • PHPCompatibility specific options
• Projects extending PHPCompatibility
• Contributing
• License

The project aims to cover all PHP compatibility changes introduced since PHP 5.0 up to the latest PHP release. This is an ongoing process and coverage is not yet 100% (if, indeed, it ever could be). Progress is tracked on our GitHub issue tracker.

Pull requests that check for compatibility issues in PHP 4 code - in particular between PHP 4 and PHP 5.0 - are very welcome as there are still situations where people need help upgrading legacy systems. However, coverage for changes introduced before PHP 5.1 will remain patchy as sniffs for this are not actively being developed at this time.

• PHP 5.4+
• PHP CodeSniffer: 3.13.0+.

The sniffs are designed to give the same results regardless of which PHP version you are using to run PHP CodeSniffer. You should get consistent results independently of the PHP version used in your test environment, though for the best results it is recommended to run the sniffs on a recent PHP version in combination with a recent PHP_CodeSniffer version.

As of version 8.0.0, the PHPCompatibility standard can also be used with PHP CodeSniffer 3.x. As of version 9.0.0, support for PHP CodeSniffer 1.5.x and low 2.x versions < 2.3.0 has been dropped. As of version 10.0.0, support for PHP < 5.4 and PHP CodeSniffer < 3.13.0 has been dropped.

Thanks to all contributors for their valuable contributions.

Thanks to WP Engine for their support on the PHP 7.0 sniffs.

This library has been reorganized. All sniffs have been placed in categories and a significant number of sniffs have been renamed.

If you use the complete PHPCompatibility standard without exclude directives in a custom ruleset and do not (yet) use the new-style PHP_CodeSniffer annotation as introduced in PHP_CodeSniffer 3.2.0, this will have no noticeable effect and everything should work as before.

However, if you do use exclude directives for PHPCompatibility sniffs in a custom ruleset or if you use the new-style PHP_CodeSniffer inline annotations, you will need to update these when upgrading. This should be a one-time only change. The changelog contains detailed information about all the sniff renames.

Please read the changelog for version 9.0.0 carefully before upgrading.

• Add the following lines to the require-dev section of your composer.json file.

  "require-dev": {
      "phpcompatibility/php-compatibility": "*"
  },
  "prefer-stable" : true

• Next, PHP CodeSniffer has to be informed of the location of the standard.

  • If PHPCompatibility is the only external PHP CodeSniffer standard you use, you can add the following to your composer.json file to automatically run the necessary command:

    "scripts": {
        "post-install-cmd": "\"vendor/bin/phpcs\" --config-set installed_paths vendor/phpcompatibility/php-compatibility",
        "post-update-cmd" : "\"vendor/bin/phpcs\" --config-set installed_paths vendor/phpcompatibility/php-compatibility"
    }

  • Alternatively - and strongly recommended if you use more than one external PHP CodeSniffer standard - you can use any of the following Composer plugins to handle this for you.

    Just add the Composer plugin you prefer to the require-dev section of your composer.json file.

    • DealerDirect/phpcodesniffer-composer-installer:"^0.6.0"
    • higidi/composer-phpcodesniffer-standards-plugin
    • SimplyAdmire/ComposerPlugins. This plugin might still work, but appears to be abandoned.

  • As a last alternative in case you use a custom ruleset, you can tell PHP CodeSniffer the path to the PHPCompatibility standard by adding the following snippet to your custom ruleset:

    <config name="installed_paths" value="vendor/phpcompatibility/php-compatibility" />

• Run composer update --lock to install both PHP CodeSniffer, the PHPCompatibility coding standard and - optionally - the Composer plugin.
• Verify that the PHPCompatibility standard is registered correctly by running ./vendor/bin/phpcs -i on the command line. PHPCompatibility should be listed as one of the available standards.
• Now you can use the following command to inspect your code:

  ./vendor/bin/phpcs -p . --standard=PHPCompatibility

• Install PHP CodeSniffer via your preferred method.

  PHP CodeSniffer offers a variety of installation methods to suit your work-flow: Composer, PEAR, a Phar file, zipped/tarred release archives or checking the repository out using Git.

  Pro-tip: Register the path to PHPCS in your system $PATH environment variable to make the phpcs command available from anywhere in your file system.

• Download the latest PHPCompatibility release and unzip/untar it into an arbitrary directory.

  You can also choose to clone the repository using git to easily update your install regularly.

• Add the path to the directory in which you placed your copy of the PHPCompatibility repo to the PHP CodeSniffer configuration using the below command from the command line:

  phpcs --config-set installed_paths /path/to/PHPCompatibility

  I.e. if you placed the PHPCompatibility repository in the /my/custom/standards/PHPCompatibility directory, you will need to add that directory to the PHP CodeSniffer installed_paths configuration variable.

  Warning: ⚠️ The installed_paths command overwrites any previously set installed_paths. If you have previously set installed_paths for other external standards, run phpcs --config-show first and then run the installed_paths command with all the paths you need separated by commas, i.e.:

  phpcs --config-set installed_paths /path/1,/path/2,/path/3

  Pro-tip: Alternatively, in case you use a custom ruleset, you can tell PHP CodeSniffer the path to the PHPCompatibility standard(s) by adding the following snippet to your custom ruleset:

  <config name="installed_paths" value="/path/to/PHPCompatibility" />

• Verify that the PHPCompatibility standard is registered correctly by running phpcs -i on the command line. PHPCompatibility should be listed as one of the available standards.

• Now you can use the following command to inspect your code:

  phpcs -p . --standard=PHPCompatibility

• Run the coding standard from the command-line with phpcs -p . --standard=PHPCompatibility.
• By default, you will only receive notifications about deprecated and/or removed PHP features.
• To get the most out of the PHPCompatibility standard, 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.
  • You can run the checks for just one specific PHP version by adding --runtime-set testVersion 5.5 to your command line command.
  • You can also specify a range of PHP versions that your code needs to support. In this situation, compatibility issues that affect any of the PHP versions in that range will be reported: --runtime-set testVersion 5.3-5.5.
  • As of PHPCompatibility 7.1.3, you can omit one part of the range if you want to support everything above or below a particular version, i.e. use --runtime-set testVersion 7.0- to run all the checks for PHP 7.0 and above.
• By default the report will be sent to the console, if you want to save the report to a file, add the following to the command line command: --report-full=path/to/report-file. For more information and other reporting options, check the PHP CodeSniffer wiki.

As of mid 2018, a limited set of framework/CMS specific rulesets is available. These rulesets are hosted in their own repositories.

• PHPCompatibilityJoomla GitHub | Packagist
• PHPCompatibilityWP GitHub | Packagist

Since the autumn of 2018, there are also a number of PHP polyfill specific rulesets available:

• PHPCompatibilityPasswordCompat GitHub | Packagist: accounts for @ircmaxell's password_compat polyfill library.
• PHPCompatibilityParagonie GitHub | Packagist: contains two rulesets which account for the Paragonie random_compat and sodium_compat polyfill libraries respectively.
• PHPCompatibilitySymfony GitHub | Packagist: contains a number of rulesets which account for various PHP polyfill libraries offered by the Symfony project. For more details about the available rulesets, please check out the README of the PHPCompatibilitySymfony repository.

If you want to make sure you have all PHPCompatibility rulesets available at any time, you can use the PHPCompatibilityAll package GitHub | Packagist.

IMPORTANT: Framework/CMS/Polyfill specific rulesets do not set the minimum PHP version for your project, so you will still need to pass a testVersion to get the most accurate results.

Like with any PHP CodeSniffer standard, you can add PHPCompatibility to a custom PHP CodeSniffer ruleset.

<?xml version="1.0"?>
<ruleset name="Custom ruleset">
    <description>My rules for PHP CodeSniffer</description>

    <!-- Run against the PHPCompatibility ruleset -->
    <rule ref="PHPCompatibility"/>

    <!-- Run against a second ruleset -->
    <rule ref="PSR2"/>

</ruleset>

You can also set the testVersion from within the ruleset:

    <!-- Check for cross-version support for PHP 5.6 and higher. -->
    <config name="testVersion" value="5.6-"/>

Other advanced options, such as changing the message type or severity of select sniffs, as described in the PHPCS Annotated ruleset wiki page are, of course, also supported.

In PHPCS 3.2.0 and lower, once you set the testVersion in the ruleset, you could not overrule it from the command-line anymore. Starting with PHPCS 3.3.0, a testVersion set via the command-line will overrule the testVersion in the ruleset.

This allows for more flexibility when, for instance, your project needs to comply with PHP 5.5-, but you have a bootstrap file which needs to be compatible with PHP 5.2-.

At this moment, there are two sniffs which have a property which can be set via the ruleset. More custom properties may become available in the future.

The PHPCompatibility.Extensions.RemovedExtensions sniff checks for removed extensions based on the function prefix used for these extensions. This might clash with userland functions using the same function prefix.

To whitelist userland functions, you can pass a comma-delimited list of function names to the sniff.

    <!-- Whitelist the mysql_to_rfc3339() and mysql_another_function() functions. -->
    <rule ref="PHPCompatibility.Extensions.RemovedExtensions">
        <properties>
            <property name="functionWhitelist" type="array" value="mysql_to_rfc3339,mysql_another_function"/>
        </properties>
    </rule>

The PHPCompatibility.Interfaces.RemovedSerializable sniff needs to know about all interfaces which extend the Serializable interface to provide the most reliable results. The sniff will warn when it encounters an interface extending the Serializable interface which is unknown to the sniff and recommend for the interface name to be added to the property.

To inform the sniff about additional interfaces providing the Serializable interface, add a snippet along the lines of the below to your custom ruleset:

    <rule ref="PHPCompatibility.Interfaces.RemovedSerializable">
        <properties>
            <property name="serializableInterfaces" type="array">
                <element value="MyCustomSerializableInterface"/>
                <element value="AnotherSerializableInterface"/>
            </property>
        </properties>
    </rule>

There are hundreds of public projects using PHPCompatibility or extending on top of it. A short list of some that you might know or have a look at :

• adamculp/php-code-quality - a Docker image doing a lot of code quality checks
• VFAC/PHP7Compatibility - a Docker container to check PHP7 Compatibility
• grumphp-php-compatibility - A plugin for GrumPHP
• PHPCompatibility Checker WordPress plugin : Wordpress site and Github
• WordPress Tide project
• PHPStorm has built-in support for PHPCompatibility
• Moodle codechecker - A plugin for Moodle coding style, including PHPCompatibility.
• Github Action - A Github Action that runs this PHPCS standard on your source code.

Contributions are very welcome. Please read the CONTRIBUTING documentation to get started.

This code is released under the GNU Lesser General Public License (LGPL). For more information, visit http://www.gnu.org/copyleft/lesser.html

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