Updated sniff to ignore attributes (ref #3283)

Author: gsherwood

src/Standards/PSR1/Sniffs/Files/SideEffectsSniff.php

@@ -178,6 +178,14 @@ private function searchForConflict($phpcsFile, $start, $end, $tokens)
                 continue;
             }
 
+            // Ignore attributes.
+            if ($tokens[$i]['code'] === T_ATTRIBUTE
+                && isset($tokens[$i]['attribute_closer']) === true
+            ) {
+                $i = $tokens[$i]['attribute_closer'];
+                continue;
+            }
+
             // Detect and skip over symbols.
             if (isset($symbols[$tokens[$i]['code']]) === true
                 && isset($tokens[$i]['scope_closer']) === true

src/Standards/PSR1/Tests/Files/SideEffectsUnitTest.1.inc

@@ -63,6 +63,7 @@ if (!interface_exists('MyInterface')) {
     interface MyInterface {}
 }
 
+#[\Attribute]
 namespace {
     class A {}
 }