~ Added PHPCS and GitHub Action to accommodate it

.github/workflows/php-lint.yml

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+name: PHP Lint
+
+on: [push]
+
+jobs:
+  PHPCS:
+    name: PHPCS
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install dependencies
+        run: composer install --dev --prefer-dist --no-progress --no-suggest
+      - name: PHPCS check
+        uses: chekalsky/phpcs-action@v1
+        with:
+          phpcs_bin_path: './vendor/bin/phpcs'

.gitignore

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+# macOS Junk Files
+.DS_Store
+
+# Composer
+/vendor
+
+# NPM/Yarn
+/node_modules
+
+# IDE
+.idea
+
+# Transpiled/Built/Minified Files
+*.js.map
+*.min.js
+*.css.map
+*.min.css
+/dist
+/js/built
+
+# Cypress
+cypress/screenshots
+cypress/videos
+
+# Private Files (Personal or sensitive info to not version control)
+.env
+.envrc
+*.log
+_output
+results.xml

composer.json

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+{
+  "require-dev": {
+    "dealerdirect/phpcodesniffer-composer-installer": "^0.7.1",
+    "wp-coding-standards/wpcs": "^2.3",
+    "phpcompatibility/php-compatibility": "*"
+  },
+  "scripts": {
+    "lint": "phpcs",
+    "lint:fix": "phpcbf"
+  }
+}

phpcs.xml

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+<?xml version="1.0"?>
+<ruleset name="Gravity Wiz Coding Standards">
+    <!-- See https://github.com/squizlabs/PHP_CodeSniffer/wiki/Annotated-ruleset.xml -->
+    <!-- See https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards -->
+    <!-- See https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards/blob/develop/WordPress-Core/ruleset.xml -->
+
+    <arg name="extensions" value="php,css"/>
+
+    <file>.</file>
+
+    <!-- Exclude Composer vendor directory. -->
+    <exclude-pattern>*/vendor/*</exclude-pattern>
+
+    <!-- Exclude NPM modules -->
+    <exclude-pattern>*/node_modules/*</exclude-pattern>
+
+    <!-- Handled by ESLint -->
+    <exclude-pattern>*.js</exclude-pattern>
+
+    <!-- Run against the PHPCompatibility ruleset -->
+    <rule ref="PHPCompatibility"/>
+    <config name="testVersion" value="5.6-"/>
+
+    <!-- Turns on the WordPress Standard -->
+    <rule ref="WordPress-Core">
+        <exclude name="WordPress.PHP.YodaConditions.NotYoda" />
+        <exclude name="WordPress.NamingConventions.ValidVariableName.UsedPropertyNotSnakeCase" />
+        <exclude name="WordPress.NamingConventions.ValidVariableName.VariableNotSnakeCase" />
+        <exclude name="WordPress.Files.FileName.InvalidClassFileName" />
+        <exclude name="PEAR.Functions.FunctionCallSignature.MultipleArguments" />
+        <exclude name="PEAR.Functions.FunctionCallSignature.ContentAfterOpenBracket" />
+        <exclude name="PEAR.Functions.FunctionCallSignature.CloseBracketLine" />
+    </rule>
+</ruleset>