Added PHPCS dependency and grunt task

.gitignore

@@ -29,4 +29,5 @@ Thumbs.db
 # Logs
 /logs
 
+# Composer
 /vendor/

Gruntfile.js

@@ -196,11 +196,12 @@ module.exports = function( grunt ) {
 			},
 			files: {
 				src:  [
-					'**/*.php', // Include all files
-					'!apigen/**', // Exclude apigen/
+					'**/*.php',         // Include all files
+					'!apigen/**',       // Exclude apigen/
 					'!node_modules/**', // Exclude node_modules/
-					'!tests/**', // Exclude tests/
-					'!tmp/**' // Exclude tmp/
+					'!tests/**',        // Exclude tests/
+					'!vendor/**',       // Exclude vendor/
+					'!tmp/**'           // Exclude tmp/
 				],
 				expand: true
 			}
@@ -226,6 +227,27 @@ module.exports = function( grunt ) {
 			apigen: {
 				src: [ 'wc-apidocs' ]
 			}
+		},
+
+		// PHP Code Sniffer.
+		phpcs: {
+			options: {
+				bin: 'vendor/bin/phpcs',
+				standard: './phpcs.ruleset.xml'
+			},
+			dist: {
+				src:  [
+					'**/*.php',                                                  // Include all files
+					'!apigen/**',                                                // Exclude apigen/
+					'!includes/api/legacy/**',                                   // Exclude legacy REST API
+					'!includes/gateways/simplify-commerce/includes/Simplify/**', // Exclude simplify commerce SDK
+					'!includes/libraries/**',                                    // Exclude libraries/
+					'!node_modules/**',                                          // Exclude node_modules/
+					'!tests/**',                                                 // Exclude tests/
+					'!tmp/**',                                                   // Exclude tmp/
+					'!vendor/**'                                                 // Exclude vendor/
+				]
+			}
 		}
 	});
 
@@ -240,6 +262,7 @@ module.exports = function( grunt ) {
 	grunt.loadNpmTasks( 'grunt-contrib-watch' );
 	grunt.loadNpmTasks( 'grunt-contrib-clean' );
 	grunt.loadNpmTasks( 'grunt-stylelint' );
+	grunt.loadNpmTasks( 'grunt-phpcs' );
 
 	// Register tasks
 	grunt.registerTask( 'default', [

composer.json

@@ -6,5 +6,16 @@
   "license": "GPL-2.0+",
   "require": {
     "composer/installers": "~1.0"
+  },
+  "require-dev": {
+    "squizlabs/php_codesniffer": "*",
+    "wp-coding-standards/wpcs": "*",
+    "wimg/php-compatibility": "*",
+    "simplyadmire/composer-plugins" : "@dev"
+  },
+  "scripts": {
+    "post-install-cmd": [
+      "./vendor/bin/phpcs --config-set installed_paths vendor/wp-coding-standards/wpcs vendor/wimg/php-compatibility"
+    ]
   }
 }