Add php_codesniffer

Signed-off-by: Jack Cherng <jfcherng@gmail.com>

Author: jfcherng

composer.json

@@ -36,14 +36,16 @@
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^2.15",
         "phan/phan": "^2.2",
-        "phpunit/phpunit": "^7.2 || ^8.2"
+        "phpunit/phpunit": "^7.2 || ^8.2",
+        "squizlabs/php_codesniffer": "^3.5"
     },
     "config": {
         "sort-packages": true
     },
     "scripts": {
         "analyze": [
-            "phan --color"
+            "phan --color",
+            "phpcs --colors -n"
         ],
         "fix": [
             "php-cs-fixer fix --verbose"

composer.lock

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<ruleset name="php-color-output">
+  <description>php-color-output</description>
+
+  <!-- <arg name="report" value="summary" /> -->
+  <!-- <arg name="colors" /> -->
+  <arg value="sp" />
+
+  <file>./src/</file>
+
+  <exclude-pattern>*/tests/*</exclude-pattern>
+
+  <rule ref="PSR1" />
+  <rule ref="PSR12" />
+</ruleset>