Adds ability for the user to choose if they want to double encode entities within textareas or not when using ActiveForm. Applies enhancement from #12988.

framework/CHANGELOG.md

@@ -45,6 +45,7 @@ Yii Framework 2 Change Log
 - Enh #12901: Added `getDefaultHelpHeader` method to the `yii\console\controllers\HelpController` class to be able to override default help header in a class heir (diezztsk)
 - Enh #13035: Use ArrayHelper::getValue() in SluggableBehavior::getValue() (thyseus)
 - Enh #13020: Added `disabledListItemSubTagOptions` attribute for `yii\widgets\LinkPager` in order to customize the disabled list item sub tag element (nadar)
+- Enh #12988: Changed `textarea` method within the `yii\helpers\BaseHtml` class to allow users to control whether html entities found within `$value` will be double-encoded or not (cyphix333)
 - Enh: Added constants for specifying `yii\validators\CompareValidator::$type` (cebe)
 
 

framework/helpers/BaseHtml.php

@@ -660,12 +660,19 @@ class BaseHtml
      * the attributes of the resulting tag. The values will be HTML-encoded using [[encode()]].
      * If a value is null, the corresponding attribute will not be rendered.
      * See [[renderTagAttributes()]] for details on how attributes are being rendered.
+     * The following special options are recognized:
+     *
+     * - `doubleEncode`: whether to double encode HTML entities in `$value`. If `false`, HTML entities in `$value` will not
+     * be further encoded. This option is available since version 2.0.11.
+     *
      * @return string the generated text area tag
      */
     public static function textarea($name, $value = '', $options = [])
     {
         $options['name'] = $name;
-        return static::tag('textarea', static::encode($value), $options);
+        // Get value, then remove from array - not needed for `renderTagAttributes` called inside the `tag` method
+        $doubleEncode = ArrayHelper::remove($options, 'doubleEncode', true);
+        return static::tag('textarea', static::encode($value, $doubleEncode), $options);
     }
 
     /**