Add initial functionality and tests

.gitattributes

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+#
+# Exclude these files from release archives.
+#
+# This will also make the files unavailable when using Composer with `--prefer-dist`.
+# If you develop using Composer, use `--prefer-source`.
+#
+# Via WPCS.
+#
+/.php_cs-fixer.dist.php export-ignore
+/phpcs.xml export-ignore
+/phpunit.xml export-ignore
+/.github export-ignore
+/tests export-ignore
+
+#
+# Auto detect text files and perform LF normalization.
+#
+# http://davidlaing.com/2012/09/19/customise-your-gitattributes-to-become-a-git-ninja/
+#
+* text=auto
+
+#
+# The above will handle all files not found below.
+#
+*.md text
+*.php text
+*.inc text

.github/pull_request_template.md

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+## Summary
+
+As titled.
+
+## Notes for reviewers
+
+None.
+
+## Changelog entries
+
+### Added
+
+- Initial release.
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Security

.github/workflows/phpcs.yml

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+name: PHPCS
+
+on:
+  pull_request:
+
+jobs:
+  coding-standards:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        php: [8.1]
+
+    name: Coding Standards
+    steps:
+      - name: Cancel previous runs of this workflow (pull requests only)
+        if: ${{ github.event_name == 'pull_request' }}
+        uses: styfle/cancel-workflow-action@0.5.0
+        with:
+          access_token: ${{ github.token }}
+
+      - name: Check out code
+        uses: actions/checkout@v2
+
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          tools: composer:v2
+          coverage: none
+
+      - name: Validate Composer config
+        run: composer validate --strict
+
+      - name: Install composer dependencies
+        uses: nick-invision/retry@v1
+        with:
+          timeout_minutes: 5
+          max_attempts: 5
+          command: composer install
+
+      - name: Run PHPCS
+        run: composer run phpcs

.github/workflows/phpunit.yml

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+name: PHPUnit
+
+on:
+  pull_request:
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        php: [8.1, 8.0, 7.4]
+        can_fail: [false]
+
+    name: PHP ${{ matrix.php }}
+    env:
+      CACHEDIR: /tmp/test-cache
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v2
+
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          tools: composer:v2
+          coverage: none
+
+      - name: Install Composer dependencies
+        uses: nick-invision/retry@v2
+        with:
+          timeout_minutes: 5
+          max_attempts: 5
+          command: composer install
+
+      - name: Run PHPUnit
+        shell: bash
+        run: composer run phpunit

.gitignore

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+vendor
+composer.lock
+.php_cs.cache
+.phpunit.result.cache

.php-cs-fixer.dist.php

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+<?php
+
+/*
+ * This file is part of the traverse/reshape package.
+ *
+ * (c) Alley <info@alley.co>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+$finder = PhpCsFixer\Finder::create()->in([
+    __DIR__ . '/src/',
+    __DIR__ . '/tests/',
+]);
+
+$config = new PhpCsFixer\Config();
+$config->setRules([
+    '@PSR12' => true,
+    '@PHP80Migration' => true,
+
+    'native_constant_invocation' => true,
+    'native_function_casing' => true,
+    'native_function_invocation' => true,
+    'native_function_type_declaration_casing' => true,
+]);
+$config->setFinder($finder);
+
+return $config;

CHANGELOG.md

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+# Changelog
+
+This library adheres to [Semantic Versioning](https://semver.org/) and [Keep a CHANGELOG](https://keepachangelog.com/en/1.0.0/).
+
+## 1.0.0
+
+Initial release.