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Showing content from https://www.yiiframework.com/doc/api/2.0/yii-helpers-unsetarrayvalue below:

UnsetArrayValue, yii\helpers\UnsetArrayValue | API Documentation for Yii 2.0

Object that represents the removal of array value while performing yii\helpers\ArrayHelper::merge().

Usage example:

$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

[
    'ids' => [
        1,
        2,
    ],
]

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