diff --git a/docs/guide/helper-array.md b/docs/guide/helper-array.md
index df4fcce176..2552816835 100644
--- a/docs/guide/helper-array.md
+++ b/docs/guide/helper-array.md
@@ -303,21 +303,68 @@ Encoding will use application charset and could be changed via third argument.
 
 ## Merging Arrays <span id="merging-arrays"></span>
 
+You can use [[yii\helpers\ArrayHelper::merge()|ArrayHelper::merge()]] to merge two or more arrays into one recursively.
+If each array has an element with the same string key value, the latter will overwrite the former
+(different from [array_merge_recursive()](http://php.net/manual/en/function.array-merge-recursive.php)).
+Recursive merging will be conducted if both arrays have an element of array type and are having the same key.
+For integer-keyed elements, the elements from the latter array will be appended to the former array.
+You can use [[yii\helpers\UnsetArrayValue]] object to unset value from previous array or
+[[yii\helpers\ReplaceArrayValue]] to force replace former value instead of recursive merging.
+
+For example:
+
 ```php
-  /**
-    * Merges two or more arrays into one recursively.
-    * If each array has an element with the same string key value, the latter
-    * will overwrite the former (different from array_merge_recursive).
-    * Recursive merging will be conducted if both arrays have an element of array
-    * type and are having the same key.
-    * For integer-keyed elements, the elements from the latter array will
-    * be appended to the former array.
-    * @param array $a array to be merged to
-    * @param array $b array to be merged from. You can specify additional
-    * arrays via third argument, fourth argument etc.
-    * @return array the merged array (the original arrays are not changed.)
-    */
-    public static function merge($a, $b)
+$array1 = [
+    'name' => 'Yii',
+    'version' => '1.1',
+    'ids' => [
+        1,
+    ],
+    'validDomains' => [
+        'example.com',
+        'www.example.com',
+    ],
+    'emails' => [
+        'admin' => 'admin@example.com',
+        'dev' => 'dev@example.com',
+    ],
+];
+
+$array2 = [
+    'version' => '2.0',
+    'ids' => [
+        2,
+    ],
+    'validDomains' => new \yii\helpers\ReplaceArrayValue([
+        'yiiframework.com',
+        'www.yiiframework.com',
+    ]),
+    'emails' => [
+        'dev' => new \yii\helpers\UnsetArrayValue(),
+    ],
+];
+
+$result = ArrayHelper::merge($array1, $array2);
+```
+
+The result will be:
+
+```php
+[
+    'name' => 'Yii',
+    'version' => '2.0',
+    'ids' => [
+        1,
+        2,
+    ],
+    'validDomains' => [
+        'yiiframework.com',
+        'www.yiiframework.com',
+    ],
+    'emails' => [
+        'admin' => 'admin@example.com',
+    ],
+]
 ```
 
 
diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index ebbff08cab..0e93ff999a 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -9,6 +9,7 @@ Yii Framework 2 Change Log
 - Bug #11912: Fixed PostgreSQL Schema to support negative default values for integer/float/decimal columns (nsknewbie)
 - Bug #11947: Fixed `gridData` initialization in `yii.gridView.js` (pavlm)
 - Bug #11949: Fixed `ActiveField::end` generates close tag when it's `option['tag']` is null (egorio)
+- Enh #11275: Added possibility of unset or force replace former value in `ArrayHelper::merge()` (mdmunir, rob006)
 - Enh #11950: Improve BaseArrayHelper::keyExists speed (egorio)
 - Bug #11726: `DbSession` was echoing database errors in production mode (samdark, pastuhov, deadkrolik)
 - Bug #12030: Fixed `yii\base\Model::offsetExists()` throws an exception on un-existing field (klimov-paul)
diff --git a/framework/helpers/BaseArrayHelper.php b/framework/helpers/BaseArrayHelper.php
index 1968772939..48ca2faccf 100644
--- a/framework/helpers/BaseArrayHelper.php
+++ b/framework/helpers/BaseArrayHelper.php
@@ -107,6 +107,8 @@ class BaseArrayHelper
      * type and are having the same key.
      * For integer-keyed elements, the elements from the latter array will
      * be appended to the former array.
+     * You can use [[UnsetArrayValue]] object to unset value from previous array or
+     * [[ReplaceArrayValue]] to force replace former value instead of recursive merging.
      * @param array $a array to be merged to
      * @param array $b array to be merged from. You can specify additional
      * arrays via third argument, fourth argument etc.
@@ -119,7 +121,11 @@ class BaseArrayHelper
         while (!empty($args)) {
             $next = array_shift($args);
             foreach ($next as $k => $v) {
-                if (is_int($k)) {
+                if ($v instanceof UnsetArrayValue) {
+                    unset($res[$k]);
+                } elseif ($v instanceof ReplaceArrayValue) {
+                    $res[$k] = $v->value;
+                } elseif (is_int($k)) {
                     if (isset($res[$k])) {
                         $res[] = $v;
                     } else {
diff --git a/framework/helpers/ReplaceArrayValue.php b/framework/helpers/ReplaceArrayValue.php
new file mode 100644
index 0000000000..48644cf2be
--- /dev/null
+++ b/framework/helpers/ReplaceArrayValue.php
@@ -0,0 +1,73 @@
+<?php
+
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\helpers;
+
+/**
+ * Object that represents the replacement of array value while performing [[ArrayHelper::merge()]].
+ *
+ * Usage example:
+ *
+ * ```php
+ * $array1 = [
+ *     'ids' => [
+ *         1,
+ *     ],
+ *     'validDomains' => [
+ *         'example.com',
+ *         'www.example.com',
+ *     ],
+ * ];
+ *
+ * $array2 = [
+ *     'ids' => [
+ *         2,
+ *     ],
+ *     'validDomains' => new \yii\helpers\ReplaceArrayValue([
+ *         'yiiframework.com',
+ *         'www.yiiframework.com',
+ *     ]),
+ * ];
+ *
+ * $result = \yii\helpers\ArrayHelper::merge($array1, $array2);
+ * ```
+ *
+ * The result will be
+ *
+ * ```php
+ * [
+ *     'ids' => [
+ *         1,
+ *         2,
+ *     ],
+ *     'validDomains' => [
+ *         'yiiframework.com',
+ *         'www.yiiframework.com',
+ *     ],
+ * ]
+ * ```
+ *
+ * @author Robert Korulczyk <robert@korulczyk.pl>
+ * @since 2.0.10
+ */
+class ReplaceArrayValue
+{
+    /**
+     * @var mixed value used as replacement.
+     */
+    public $value;
+
+    /**
+     * Constructor.
+     * @param mixed $value value used as replacement.
+     */
+    public function __construct($value)
+    {
+        $this->value = $value;
+    }
+}
diff --git a/framework/helpers/UnsetArrayValue.php b/framework/helpers/UnsetArrayValue.php
new file mode 100644
index 0000000000..0cb48021ac
--- /dev/null
+++ b/framework/helpers/UnsetArrayValue.php
@@ -0,0 +1,53 @@
+<?php
+
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\helpers;
+
+/**
+ * Object that represents the removal of array value while performing [[ArrayHelper::merge()]].
+ *
+ * Usage example:
+ *
+ * ```php
+ * $array1 = [
+ *     'ids' => [
+ *         1,
+ *     ],
+ *     'validDomains' => [
+ *         'example.com',
+ *         'www.example.com',
+ *     ],
+ * ];
+ *
+ * $array2 = [
+ *     'ids' => [
+ *         2,
+ *     ],
+ *     'validDomains' => new \yii\helpers\UnsetArrayValue(),
+ * ];
+ *
+ * $result = \yii\helpers\ArrayHelper::merge($array1, $array2);
+ * ```
+ *
+ * The result will be
+ *
+ * ```php
+ * [
+ *     'ids' => [
+ *         1,
+ *         2,
+ *     ],
+ * ]
+ * ```
+ *
+ * @author Robert Korulczyk <robert@korulczyk.pl>
+ * @since 2.0.10
+ */
+class UnsetArrayValue
+{
+}
diff --git a/tests/framework/helpers/ArrayHelperTest.php b/tests/framework/helpers/ArrayHelperTest.php
index c8a89c3c97..16184ddde9 100644
--- a/tests/framework/helpers/ArrayHelperTest.php
+++ b/tests/framework/helpers/ArrayHelperTest.php
@@ -307,6 +307,79 @@ class ArrayHelperTest extends TestCase
         $this->assertEquals($expected, $result);
     }
 
+    public function testMergeWithUnset()
+    {
+        $a = [
+            'name' => 'Yii',
+            'version' => '1.0',
+            'options' => [
+                'namespace' => false,
+                'unittest' => false,
+            ],
+            'features' => [
+                'mvc',
+            ],
+        ];
+        $b = [
+            'version' => '1.1',
+            'options' => new \yii\helpers\UnsetArrayValue(),
+            'features' => [
+                'gii',
+            ],
+        ];
+
+        $result = ArrayHelper::merge($a, $b);
+        $expected = [
+            'name' => 'Yii',
+            'version' => '1.1',
+            'features' => [
+                'mvc',
+                'gii',
+            ],
+        ];
+
+        $this->assertEquals($expected, $result);
+    }
+
+    public function testMergeWithReplace()
+    {
+        $a = [
+            'name' => 'Yii',
+            'version' => '1.0',
+            'options' => [
+                'namespace' => false,
+                'unittest' => false,
+            ],
+            'features' => [
+                'mvc',
+            ],
+        ];
+        $b = [
+            'version' => '1.1',
+            'options' => [
+                'unittest' => true,
+            ],
+            'features' => new \yii\helpers\ReplaceArrayValue([
+                'gii',
+            ]),
+        ];
+
+        $result = ArrayHelper::merge($a, $b);
+        $expected = [
+            'name' => 'Yii',
+            'version' => '1.1',
+            'options' => [
+                'namespace' => false,
+                'unittest' => true,
+            ],
+            'features' => [
+                'gii',
+            ],
+        ];
+
+        $this->assertEquals($expected, $result);
+    }
+
     /**
      * @see https://github.com/yiisoft/yii2/pull/11549
      */