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Refactor the requirements check
The requirements check (minimum PHP version + extensions) needs to stay PHP cross-version compatible to allow it to work properly. As things were, what with the autoloader being loaded before the requirements check was run and the requirements check being part of the `Runner` class, this would block any PHP modernizations from being made to these files. It is my opinion that the requirements check: 1. Should be run before anything else. 2. Should involve as few files as possible to prevent the check blocking code modernizations and raising the cognitive load for contributors. To this end, I'm introducing a new `requirements.php` file in the project root. This file will be loaded in the bootstrapping of PHPCS/PHPCBF, both when running via the plain files (Composer, git clone), as well as when running via the PHAR file. This means there will now be only three files which need to stay PHP cross-version compatible: * `bin/phpcs` * `bin/phpcbf` * `requirements.php` A very explicit warning about the need for these files to stay cross-version compatible has been added to in the file docblock of each of these files. The PHP minimum for these three files has been set to PHP 5.3 for the following reasons: 1. The minimum PHP version for PHPCS 3.x was PHP 5.4, so chances of people trying to run PHPCS on a PHP version older than PHP 5.4 are slim. 2. The requirements check in PHPCS 3.x was already broken due to the use of a) namespace separators in the `bin/*` files (PHP 5.3+) and b) short arrays in the actual requirements check code (PHP 5.4+). 3. Testing - and therefore safeguarding - the functionality of the requirements check on PHP versions older than PHP 5.3 is not possible as PHP < 5.3 is [not supported by setup-php](https://github.com/shivammathur/setup-php#tada-php-support). Alongside the changes to the requirement checking, this commit also introduces a new GH Actions workflow to safeguard the requirements check for the future (and two helper scripts for use in the workflow). This workflow will only run selectively when files involved in the requirements check, and the testing thereof, are changed. Note: the exit code has not been changed (yet). This will be handled separately when addressing issue 184. Fixes 530
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‎.github/workflows/test-requirements-check.yml‎

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name: Test requirements check
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on:
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# Run on pushes to the main branches and on pull requests which touch files related to the requirements check.
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# No need to run this workflow when there are only irrelevant changes.
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push:
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branches:
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- 4.x
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tags:
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- '**'
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paths:
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- '.github/workflows/test-requirements-check.yml'
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- '.github/workflows/reusable-build-phar.yml'
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- 'bin/phpcs'
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- 'bin/phpcbf'
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- 'phpcs.xml.dist'
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- 'requirements.php'
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- 'scripts/**'
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pull_request:
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paths:
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- '.github/workflows/test-requirements-check.yml'
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- '.github/workflows/reusable-build-phar.yml'
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- 'bin/phpcs'
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- 'bin/phpcbf'
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- 'phpcs.xml.dist'
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- 'requirements.php'
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- 'scripts/**'
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# Allow manually triggering the workflow.
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workflow_dispatch:
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# Cancels all previous workflow runs for the same branch that have not yet completed.
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concurrency:
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# The concurrency group contains the workflow name and the branch name.
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group: ${{ github.workflow }}-${{ github.ref }}
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cancel-in-progress: true
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jobs:
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# Make sure that the files involved in the requirements check don't contain parse errors
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# for the PHP versions supported by the requirements check to prevent the tests being run
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# failing on the parse errors instead of on the requirements check
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# (which would easily go unnoticed).
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lint:
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runs-on: ubuntu-latest
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strategy:
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matrix:
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php: ['5.3', '5.4', '5.5', '5.6', '7.0', '7.1']
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name: "Lint: PHP ${{ matrix.php }}"
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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- name: Install PHP
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uses: shivammathur/setup-php@v2
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with:
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php-version: ${{ matrix.php }}
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coverage: none
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- name: "Lint bin/phpcs"
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run: php -l ./bin/phpcs
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- name: "Lint bin/phpcbf"
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run: php -l ./bin/phpcbf
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- name: "Lint requirements.php"
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run: php -l ./requirements.php
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# The matrix for these tests should be the same for the "plain" file test as for the PHAR test.
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# This matrix, however, is quite complex, making maintaining it manually pretty error prone.
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# So this job uses a PHP script to generate the matrix based on a fixed set of variables.
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#
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# The resulting matrix contains builds which combine the following variables:
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# - os: ubuntu / windows
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# - cmd: phpcs / phpcbf
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# - php: 7.2 (minimum PHP version for 4.x), latest and nightly with the required extensions (should pass the check).
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# - php: 5.3 (minimum for the requirements check) and 7.1 with the required extension (should fail the PHP version check).
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# - php: 7.2 (minimum PHP version for 4.x), latest and nightly WITHOUT required extensions (should fail the check for extensions).
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#
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# Each combination also contains a "expect" key to set the expectations for success / failure.
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#
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# The scripts involved in generating the matrix can be found in the `/scripts/` directory.
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prepare-matrix:
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needs: lint
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name: Get test matrix
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runs-on: ubuntu-latest
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outputs:
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matrix: ${{ steps.set-matrix.outputs.MATRIX }}
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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- name: Install PHP
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uses: shivammathur/setup-php@v2
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with:
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php-version: 'latest'
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ini-values: 'error_reporting=-1, display_errors=On'
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coverage: none
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- name: Set matrix
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id: set-matrix
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run: echo "MATRIX=$(php scripts/get-requirements-check-matrix.php)" >> "$GITHUB_OUTPUT"
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- name: "DEBUG: show generated matrix"
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run: echo ${{ steps.set-matrix.outputs.MATRIX }}
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# Test that the requirements check works correctly when using a Composer install or git clone of PHPCS.
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test-plain:
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needs: prepare-matrix
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strategy:
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fail-fast: false
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matrix: ${{ fromJson(needs.prepare-matrix.outputs.MATRIX) }}
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# yamllint disable-line rule:line-length
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name: "Plain: ${{ matrix.cmd == 'phpcs' && 'cs' || 'cbf' }} / ${{ matrix.php }} / ${{ matrix.name }} (${{ matrix.os == 'ubuntu-latest' && 'nix' || 'Win' }})"
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continue-on-error: ${{ matrix.php == 'nightly' }}
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runs-on: ${{ matrix.os }}
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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- name: Install PHP
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uses: shivammathur/setup-php@v2
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with:
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php-version: ${{ matrix.php }}
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ini-values: 'error_reporting=-1, display_errors=On'
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extensions: ${{ matrix.extensions }}
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coverage: none
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env:
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fail-fast: true
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# We're only testing the requirements check here, so we just need to verify that PHPCS/PHPCBF starts. Nothing more.
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- name: Run the test
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id: check
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continue-on-error: true
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run: php "bin/${{ matrix.cmd }}" --version
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- name: Check the result of a successful test against expectation
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if: ${{ steps.check.outcome == 'success' && matrix.expect == 'fail' }}
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run: exit 1
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- name: Check the result of a failed test against expectation
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if: ${{ steps.check.outcome != 'success' && matrix.expect == 'success' }}
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run: exit 1
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build-phars:
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needs: lint
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name: "Build Phar on PHP 8.0"
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uses: ./.github/workflows/reusable-build-phar.yml
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with:
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uploadArtifacts: true
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# Test that the requirements check works correctly when using a PHPCS/PHPCBF PHAR file.
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test-phar:
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needs: [prepare-matrix, build-phars]
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strategy:
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fail-fast: false
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matrix: ${{ fromJson(needs.prepare-matrix.outputs.MATRIX) }}
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# yamllint disable-line rule:line-length
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name: "PHAR: ${{ matrix.cmd == 'phpcs' && 'cs' || 'cbf' }} / ${{ matrix.php }} / ${{ matrix.name }} (${{ matrix.os == 'ubuntu-latest' && 'nix' || 'Win' }})"
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continue-on-error: ${{ matrix.php == 'nightly' }}
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runs-on: ${{ matrix.os }}
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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- name: Install PHP
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uses: shivammathur/setup-php@v2
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with:
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php-version: ${{ matrix.php }}
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ini-values: 'error_reporting=-1, display_errors=On'
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extensions: ${{ matrix.extensions }}
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coverage: none
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env:
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fail-fast: true
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- name: Download the phar
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uses: actions/download-artifact@v4
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with:
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name: ${{ matrix.cmd }}-phar
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# We're only testing the requirements check here, so we just need to verify that PHPCS/PHPCBF starts. Nothing more.
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- name: Run the test
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id: check
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continue-on-error: true
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run: php ${{ matrix.cmd }}.phar --version
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- name: Check the result of a successful test against expectation
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if: ${{ steps.check.outcome == 'success' && matrix.expect == 'fail' }}
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run: exit 1
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- name: Check the result of a failed test against expectation
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if: ${{ steps.check.outcome != 'success' && matrix.expect == 'success' }}
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run: exit 1

‎bin/phpcbf‎

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/**
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* PHP Code Beautifier and Fixer fixes violations of a defined coding standard.
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*
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* :WARNING:
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* This file MUST stay cross-version compatible with older PHP versions (min: PHP 5.3) to allow
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* for the requirements check to work correctly.
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*
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* The PHP 5.3 minimum is set as the previous PHPCS major (3.x) already had a PHP 5.4 minimum
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* requirement and didn't take parse errors caused due to the use of namespaces into account
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* in its requirements check, so running PHPCS 3.x on PHP < 5.3 would have failed with a parse
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* error already anyway, so PHP 5.3 seems reasonable to keep as the minimum for this.
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* :WARNING:
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*
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* @author Greg Sherwood <[email protected]>
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* @author Juliette Reinders Folmer <[email protected]>
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* @copyright 2006-2015 Squiz Pty Ltd (ABN 77 084 670 600)
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* @copyright 2024 PHPCSStandards and contributors
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* @license https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/master/licence.txt BSD Licence
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*/
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require_once __DIR__.'/../autoload.php';
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// Check if the PHP version and extensions comply with the minimum requirements before anything else.
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require_once dirname(__DIR__).'/requirements.php';
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PHP_CodeSniffer\checkRequirements();
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require_once dirname(__DIR__).'/autoload.php';
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$runner = new PHP_CodeSniffer\Runner();
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$exitCode = $runner->runPHPCBF();

‎bin/phpcs‎

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/**
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* PHP_CodeSniffer detects violations of a defined coding standard.
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*
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* :WARNING:
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* This file MUST stay cross-version compatible with older PHP versions (min: PHP 5.3) to allow
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* for the requirements check to work correctly.
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*
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* The PHP 5.3 minimum is set as the previous PHPCS major (3.x) already had a PHP 5.4 minimum
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* requirement and didn't take parse errors caused due to the use of namespaces into account
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* in its requirements check, so running PHPCS 3.x on PHP < 5.3 would have failed with a parse
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* error already anyway, so PHP 5.3 seems reasonable to keep as the minimum for this.
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* :WARNING:
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*
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* @author Greg Sherwood <[email protected]>
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* @author Juliette Reinders Folmer <[email protected]>
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* @copyright 2006-2015 Squiz Pty Ltd (ABN 77 084 670 600)
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* @copyright 2024 PHPCSStandards and contributors
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* @license https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/master/licence.txt BSD Licence
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*/
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require_once __DIR__.'/../autoload.php';
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// Check if the PHP version and extensions comply with the minimum requirements before anything else.
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require_once dirname(__DIR__).'/requirements.php';
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PHP_CodeSniffer\checkRequirements();
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require_once dirname(__DIR__).'/autoload.php';
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$runner = new PHP_CodeSniffer\Runner();
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$exitCode = $runner->runPHPCS();

‎phpcs.xml.dist‎

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<description>The coding standard for PHP_CodeSniffer itself.</description>
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<file>autoload.php</file>
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<file>requirements.php</file>
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<file>bin</file>
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<file>scripts</file>
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<file>src</file>
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<rule ref="Squiz.WhiteSpace.MemberVarSpacing"/>
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<rule ref="Squiz.WhiteSpace.OperatorSpacing"/>
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<rule ref="Squiz.WhiteSpace.SuperfluousWhitespace"/>
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<rule ref="Generic.Arrays.DisallowLongArraySyntax"/>
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<rule ref="Generic.Arrays.DisallowLongArraySyntax">
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<!-- Files involved in the requirements check should stay compatible with PHP 5.3. -->
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<exclude-pattern>bin/phpc(s|bf)$</exclude-pattern>
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<exclude-pattern>requirements\.php$</exclude-pattern>
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</rule>
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<rule ref="Generic.Commenting.Todo"/>
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<rule ref="Generic.ControlStructures.DisallowYodaConditions"/>
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<rule ref="Generic.ControlStructures.InlineControlStructure"/>

‎phpstan.neon.dist‎

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max: 80499
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level: 0
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paths:
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- requirements.php
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- src
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bootstrapFiles:
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- tests/bootstrap.php

‎requirements.php‎

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<?php
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/**
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* Requirements check for PHP_CodeSniffer.
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*
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* :WARNING:
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* This file MUST stay cross-version compatible with older PHP versions (min: PHP 5.3) to allow
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* for the requirements check to work correctly.
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*
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* The PHP 5.3 minimum is set as the previous PHPCS major (3.x) already had a PHP 5.4 minimum
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* requirement and didn't take parse errors caused due to the use of namespaces into account
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* in its requirements check, so running PHPCS 3.x on PHP < 5.3 would have failed with a parse
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* error already anyway, so PHP 5.3 seems reasonable to keep as the minimum for this.
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* :WARNING:
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*
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* @author Greg Sherwood <[email protected]>
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* @author Juliette Reinders Folmer <[email protected]>
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* @copyright 2006-2015 Squiz Pty Ltd (ABN 77 084 670 600)
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* @copyright 2024 PHPCSStandards and contributors
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* @license https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/master/licence.txt BSD Licence
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*/
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namespace PHP_CodeSniffer;
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/**
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* Exits if the minimum requirements of PHP_CodeSniffer are not met.
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*
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* @return void
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*/
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function checkRequirements()
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{
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$exitCode = 3;
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// Check the PHP version.
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if (PHP_VERSION_ID < 70200) {
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echo 'ERROR: PHP_CodeSniffer requires PHP version 7.2.0 or greater.'.PHP_EOL;
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exit($exitCode);
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}
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$requiredExtensions = array(
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'tokenizer',
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'xmlwriter',
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'SimpleXML',
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);
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$missingExtensions = array();
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foreach ($requiredExtensions as $extension) {
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if (extension_loaded($extension) === false) {
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$missingExtensions[] = $extension;
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}
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}
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if (empty($missingExtensions) === false) {
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$last = array_pop($requiredExtensions);
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$required = implode(', ', $requiredExtensions);
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$required .= ' and '.$last;
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if (count($missingExtensions) === 1) {
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$missing = $missingExtensions[0];
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} else {
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$last = array_pop($missingExtensions);
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$missing = implode(', ', $missingExtensions);
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$missing .= ' and '.$last;
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}
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$error = 'ERROR: PHP_CodeSniffer requires the %s extensions to be enabled. Please enable %s.'.PHP_EOL;
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printf($error, $required, $missing);
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exit($exitCode);
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}
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}//end checkRequirements()

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