数组合并不合并一个元素

数组 1 ： $gpsArr

Array
(
    [store_id] => Array
        (
            [0] => 101
        )
    [store_name] => Array
        (
            [0] => Out of the Blue - Powai
        )
    [store_logo] => Array
        (
            [0] => /Out-of-the-Blue-Powai.jpg
        )
    [deals_image] => Array
        (
            [0] => 
        )
)

阵列 2 ： $dataArr

Array
(
    [store_id] => Array
        (
            [0] => 87
            [1] => 88
            [2] => 99
            [3] => 100
        )
    [store_name] => Array
        (
            [0] => The Barking Deer Brewpub
            [1] => The Den
            [2] => Mini Punjab's Chinese Court
            [3] => Out of the Blue - Khar
        )
    [store_logo] => Array
        (
            [0] => /The-barking-deer-brewpub.png
            [1] => /the-den.png
            [2] => /Mini-Punjabs-Chinese-Court-Bandra.png
            [3] => /Out-of-the-Blue-Khar.jpg
        )
    [deals_image] => Array
        (
            [0] => the-barking-deer-brewpub-thumb297.jpg
            [1] => the-den-thumb297.jpg
            [2] => mini-punjub-chinese-court-thumb297.jpg
            [3] => out-of-the-blue-Khar-thumb297.jpg
        )
)

通过使用以下代码合并上面的两个数组：

$result = array_unique(array_merge($gpsArr,$dataArr), SORT_REGULAR);

返回以下结果：

Array
(
    [store_id] => Array
        (
            [0] => 87
            [1] => 88
            [2] => 99
            [3] => 100
        )
    [store_name] => Array
        (
            [0] => The Barking Deer Brewpub
            [1] => The Den
            [2] => Mini Punjab's Chinese Court
            [3] => Out of the Blue - Khar
        )
    [store_logo] => Array
        (
            [0] => /The-barking-deer-brewpub.png
            [1] => /the-den.png
            [2] => /Mini-Punjabs-Chinese-Court-Bandra.png
            [3] => /Out-of-the-Blue-Khar.jpg
        )
    [deals_image] => Array
        (
            [0] => the-barking-deer-brewpub-thumb297.jpg
            [1] => the-den-thumb297.jpg
            [2] => mini-punjub-chinese-court-thumb297.jpg
            [3] => out-of-the-blue-Khar-thumb297.jpg
        )
)

如您所见store_id = 101合并数组后不显示。为什么会这样？我想我做了什么愚蠢的事情，但你能告诉我我做错了什么吗？

提前谢谢。