refactor: add CITestStreamFilter to phpstan-analysed list and fix errors (#9515)

Author: paulbalandan

phpstan.neon.dist

@@ -19,7 +19,6 @@ parameters:
             - system/Commands/Generators/Views/*
             - system/Debug/Toolbar/Views/toolbar.tpl.php
             - system/Images/Handlers/GDHandler.php
-            - system/Test/Filters/CITestStreamFilter.php
             - system/ThirdParty/*
             - system/Validation/Views/single.php
             - tests/system/View/Views/*

system/Test/Filters/CITestStreamFilter.php

@@ -48,13 +48,14 @@ class CITestStreamFilter extends php_user_filter
      * @param resource $out
      * @param int      $consumed
      * @param bool     $closing
+     *
+     * @param-out int $consumed
      */
     public function filter($in, $out, &$consumed, $closing): int
     {
         while ($bucket = stream_bucket_make_writeable($in)) {
             static::$buffer .= $bucket->data;
-
-            $consumed += $bucket->datalen;
+            $consumed += (int) $bucket->datalen;
         }
 
         return PSFS_PASS_ON;
@@ -92,11 +93,13 @@ public static function removeOutputFilter(): void
     }
 
     /**
-     * @param resource $stream
+     * @param resource|null $stream
+     *
+     * @param-out null $stream
      */
     protected static function removeFilter(&$stream): void
     {
-        if (is_resource($stream)) {
+        if ($stream !== null) {
             stream_filter_remove($stream);
             $stream = null;
         }