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.
+#
+/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
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Security

.github/workflows/composer.yml

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+name: Composer Validation
+
+on:
+  pull_request:
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        php: [8.1]
+    steps:
+      - name: Cancel previous runs of this workflow (pull requests only)
+        if: ${{ github.event_name == 'pull_request' }}
+        uses: styfle/[email protected]
+        with:
+          access_token: ${{ github.token }}
+
+      - name: Check out code
+        uses: actions/checkout@v3
+
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          tools: composer:v2
+          coverage: none
+
+      - name: Run Composer config validation
+        run: composer validate --strict

.github/workflows/cs.yml

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+name: Coding Standards
+
+on:
+  pull_request:
+
+jobs:
+  phpcs:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        php: [7.4]
+    steps:
+      - name: Cancel previous runs of this workflow (pull requests only)
+        if: ${{ github.event_name == 'pull_request' }}
+        uses: styfle/[email protected]
+        with:
+          access_token: ${{ github.token }}
+
+      - name: Check out code
+        uses: actions/checkout@v3
+
+      - 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@v1
+        with:
+          timeout_minutes: 5
+          max_attempts: 5
+          command: composer install
+
+      - name: Run PHPCS
+        run: composer run phpcs

.github/workflows/tests.yml

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+name: Tests
+
+on:
+  pull_request:
+
+jobs:
+  phpunit:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        php: [8.1, 8.0, 7.4]
+        wp_version: ["latest"]
+        can_fail: [false]
+        multisite: [0,1]
+    services:
+      mysql:
+        image: mysql:5.7
+        env:
+          MYSQL_ALLOW_EMPTY_PASSWORD: yes
+        ports:
+          - 3306:3306
+        options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=3
+    continue-on-error: ${{ matrix.multisite == '1' }}
+
+    name: WordPress ${{ matrix.wp_version }} @ PHP ${{ matrix.php }} (WP_MULTISITE=${{ matrix.multisite }})
+    env:
+      CACHEDIR: /tmp
+      WP_CORE_DIR: /tmp/wordpress
+      WP_VERSION: ${{ matrix.wp_version }}
+      WP_MULTISITE: ${{ matrix.multisite }}
+      WP_DB_HOST: 127.0.0.1
+      WP_DB_USER: root
+      WP_DB_PASSWORD: '""'
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v3
+
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: json, mysqli, curl, dom, exif, fileinfo, hash, imagick, mbstring, openssl, pcre, xml, zip
+          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
+        run: composer run phpunit

.gitignore

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

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.