Make InnerFunctionsSniff detect functions inside closures

Author: Daimona

src/Standards/Squiz/Sniffs/PHP/InnerFunctionsSniff.php

@@ -43,8 +43,11 @@ public function process(File $phpcsFile, $stackPtr)
 
         $function = $phpcsFile->getCondition($stackPtr, T_FUNCTION);
         if ($function === false) {
-            // Not a nested function.
-            return;
+            $function = $phpcsFile->getCondition($stackPtr, T_CLOSURE);
+            if ($function === false) {
+                // Not a nested function.
+                return;
+            }
         }
 
         $class = $phpcsFile->getCondition($stackPtr, T_ANON_CLASS, false);

src/Standards/Squiz/Tests/PHP/InnerFunctionsUnitTest.inc

@@ -48,3 +48,10 @@ new class {
         }
     }
 };
+
+$outerClosure = function ()
+{
+    // Functions inside closures are not allowed.
+    function innerFunction() {
+    }
+};

src/Standards/Squiz/Tests/PHP/InnerFunctionsUnitTest.php

@@ -28,6 +28,7 @@ public function getErrorList()
         return [
             5  => 1,
             46 => 1,
+            55 => 1,
         ];
 
     }//end getErrorList()