Add dependency on zetacomponents/coding-standard and run in CI.

Author: beberlei

Diff for: .github/workflows/coding-standard.yml

@@ -0,0 +1,15 @@
+name: Coding Standard
+
+on:
+  # Run on all pushes and on all pull requests.
+  push:
+    branches:
+      master
+  pull_request:
+  # Allow manually triggering the workflow.
+  workflow_dispatch:
+
+jobs:
+  test:
+    uses: "zetacomponents/.github/.github/workflows/coding-standard.yml@master"
+

Diff for: .gitignore

@@ -6,3 +6,4 @@
 /.pear
 /composer.phar
 .phpunit.result.cache
+.phpcs-cache

Diff for: composer.json

@@ -55,9 +55,15 @@
         },
         "require-dev": {
             "phpunit/phpunit": "~8.0",
-            "zetacomponents/unit-test": "^1.1.5"
+            "zetacomponents/unit-test": "^1.1.5",
+        "zetacomponents/coding-standard": "dev-main"
         },
         "suggest": {
             "ext-gd": "Used by the GD driver, one of the choices for generating bitmap images."
+        },
+    "config": {
+        "allow-plugins": {
+            "dealerdirect/phpcodesniffer-composer-installer": true
         }
+    }
 }

Diff for: phpcs.xml.dist

@@ -0,0 +1,16 @@
+<?xml version="1.0"?>
+<ruleset>
+    <arg name="basepath" value="."/>
+    <arg name="extensions" value="php"/>
+    <arg name="cache" value=".phpcs-cache"/>
+    <arg name="colors"/>
+
+    <!-- Ignore warnings, show progress of the run and show sniff names -->
+    <arg value="nps"/>
+
+    <config name="php_version" value="70200"/>
+
+    <file>src</file>
+
+    <rule ref="ZetaComponents" />
+</ruleset>