Fix #18328: Raise warning when trying to register a file after `View::endBody()` has been called

framework/CHANGELOG.md

@@ -4,6 +4,7 @@ Yii Framework 2 Change Log
 2.0.44 under development
 ------------------------
 
+- Enh #18328: Raise warning when trying to register a file after `View::endBody()` has been called (perlexed)
 - Enh #18812: Added error messages and optimized "error" methods in `yii\helpers\BaseJson` (WinterSilence, samdark)
 - Chg #18823: Rollback changes #18806 in `yii\validators\ExistValidator::checkTargetRelationExistence()` (WinterSilence)
 - Enh #18826: Add ability to turn the sorting off for a clicked column in GridView with multisort (ditibal)

framework/web/View.php

@@ -133,6 +133,12 @@ class View extends \yii\base\View
 
     private $_assetManager;
 
+    /**
+     * Whether [[endBody()]] has been called
+     * @var bool
+     */
+    private $_isBodyEnded = false;
+
 
     /**
      * Marks the position of an HTML head section.
@@ -159,6 +165,8 @@ class View extends \yii\base\View
         $this->trigger(self::EVENT_END_BODY);
         echo self::PH_BODY_END;
 
+        $this->_isBodyEnded = true;
+
         foreach (array_keys($this->assetBundles) as $bundle) {
             $this->registerAssetFiles($bundle);
         }
@@ -490,6 +498,10 @@ class View extends \yii\base\View
         }
         $appendTimestamp = ArrayHelper::remove($options, 'appendTimestamp', $assetManagerAppendTimestamp);
 
+        if ($this->_isBodyEnded) {
+            Yii::warning('You\'re trying to register a file after View::endBody() has been called');
+        }
+
         if (empty($depends)) {
             // register directly without AssetManager
             if ($appendTimestamp && Url::isRelative($url)) {