Revert "Fixed #11973: `yii\helpers\BaseHtml::getAttributeValue()` fixed to work with `items[]` notation correctly"

This reverts commit 3fcc26996b.

framework/helpers/BaseHtml.php

@@ -2043,7 +2043,7 @@ class BaseHtml
         }
         $attribute = $matches[2];
         $value = $model->$attribute;
-        if ($matches[3] !== '' && $matches[3] !== '[]') {
+        if ($matches[3] !== '') {
             foreach (explode('][', trim($matches[3], '[]')) as $id) {
                 if ((is_array($value) || $value instanceof \ArrayAccess) && isset($value[$id])) {
                     $value = $value[$id];

tests/framework/helpers/HtmlTest.php

@@ -1026,21 +1026,6 @@ EOD;
         $noCsrfForm = Html::beginForm('/index.php', 'post', ['csrf' => false, 'id' => 'myform']);
         $this->assertEquals('<form id="myform" action="/index.php" method="post">', $noCsrfForm);
     }
-
-    public function testGetAttributeValue()
-    {
-        $model = new HtmlTestModel();
-        $model->types = ['type1', 'type2', ['sub-array', 'sub-array2']];
-
-        $this->assertEquals($model->types, Html::getAttributeValue($model, 'types'));
-        $this->assertEquals($model->types, Html::getAttributeValue($model, 'types[]'));
-        $this->assertEquals('type1', Html::getAttributeValue($model, 'types[0]'));
-        $this->assertEquals('type2', Html::getAttributeValue($model, 'types[1]'));
-        $this->assertEquals('type2', Html::getAttributeValue($model, 'types[1][]'));
-        $this->assertEquals(['sub-array', 'sub-array2'], Html::getAttributeValue($model, 'types[2][]'));
-        $this->assertEquals('sub-array2', Html::getAttributeValue($model, 'types[2][1]'));
-        $this->assertEquals(null, Html::getAttributeValue($model, 'types[3]'));
-    }
 }
 
 /**