Add example for PHPCS.

.arclint

@@ -44,6 +44,14 @@
     "generated" : {
       "type" : "generated",
       "include" : "(.*)"
+    },
+    "phpcs" : {
+      "type" : "phpcs",
+      "include" : "(\\.php)",
+      "severity.rules" : {
+        "(^PHPCS\\.E\\.)" : "warning",
+        "(^PHPCS\\.W\\.)" : "advice"
+      }
     }
   }
 }

example.php

@@ -0,0 +1,10 @@
+<?php
+
+function f() {
+  $$g;
+
+  $x = $y;
+  $x  = $y;
+
+  $h++;
+}