PHP 8.0 | Generic/UnusedFunctionParameter: add support for constructor property promotion

When constructor property promotion is used, the properties declared in the class constructor should never be marked as unused by this sniff.

Includes tests.

Fixes 3269

Author: jrfnl

src/Standards/Generic/Sniffs/CodeAnalysis/UnusedFunctionParameterSniff.php

@@ -90,6 +90,11 @@ public function process(File $phpcsFile, $stackPtr)
         }
 
         foreach ($methodParams as $param) {
+            if (isset($param['property_visibility']) === true) {
+                // Ignore. Constructor property promotion.
+                continue;
+            }
+
             $params[$param['name']] = $stackPtr;
         }
 

src/Standards/Generic/Tests/CodeAnalysis/UnusedFunctionParameterUnitTest.inc

@@ -137,3 +137,16 @@ function moreParamFirst(Exception $foo, LogicException $bar) {
 function moreParamSecond(LogicException $bar, Exception $foo) {
     return 'foobar' . $bar;
 }
+// phpcs:set Generic.CodeAnalysis.UnusedFunctionParameter ignoreTypeHints[]
+
+class ConstructorPropertyPromotionNoContentInMethod {
+    public function __construct(protected int $id) {}
+}
+
+class ConstructorPropertyPromotionWithContentInMethod {
+    public function __construct(protected int $id, $toggle = true) {
+        if ($toggle === true) {
+            doSomething();
+        }
+    }
+}