php从数组中获取子数组

这是一个数组，我想提取“category_input”作为子数组。此子数组包含“cat_id”和“post titles”。然后，我想在每个类别下将帖子插入WordPress DB。是cat_20将有名为post-in-cat-20的帖子，以此类推

Array
(
    [post_type] => post
    [post_status] => publish
    [content_texarea] => 
    [category_input] => Array
        (
            [0] => cat_20
            [1] => post-in-cat-20
            [2] => post-in-cat-20
            [3] => post-in-cat-20
            [4] => cat_19
            [5] => post-in-cat-19
            [6] => post-in-cat-19
            [7] => post-in-cat-19
            [8] => post-in-cat-19
            [9] => cat_2
            [10] => post-in-cat-2
            [11] => post-in-cat-2
            [12] => post-in-cat-2
        )

)

预期结果

提取的数组将如下所示

    [category_input] => Array
    (
        [0] => cat_20
        [1] => post-in-cat-20
        [2] => post-in-cat-20
        [3] => post-in-cat-20
        [4] => cat_19
        [5] => post-in-cat-19
        [6] => post-in-cat-19
        [7] => post-in-cat-19
        [8] => post-in-cat-19
        [9] => cat_2
        [10] => post-in-cat-2
        [11] => post-in-cat-2
        [12] => post-in-cat-2
    )

然后，我需要制作caegory和posts数组，以便在wp查询中使用

    [category_input] => Array
    (
        [cat_20] => Array
            [1] => post-in-cat-20
            [2] => post-in-cat-20
            [3] => post-in-cat-20
        [cat_19] => Array
            [5] => post-in-cat-19
            [6] => post-in-cat-19
            [7] => post-in-cat-19
            [8] => post-in-cat-19
        [cat_2] => Array
            [10] => post-in-cat-2
            [11] => post-in-cat-2
            [12] => post-in-cat-2
    )

---

当您想要更新数组的部分时，请查看给定的部分

通过

$main_arr[category_input]从主数组中提取数组

foreach($category_input as $val){
    $part = explode('_', $val);
    if(isset($part[0]) && $part[0] == 'cat'){
        $out_arr[$val] = array();
        $key = $val;
    }else{
        $out_arr[$key][] = $val;
    }
}

请看完整的示例：

现在您可以将
$out\u arr
再次放入
$main\u arr
请添加期望的结果，其中一个是您想要的输出？？第二个？？是的第二个结果核对答案让我测试一下兄弟！弗雷恩！我想我把你弄糊涂了。首先，我希望得到索引“category\u input”的子数组。通过使用
$main\u arr[category\u input]
可以得到子数组@Frayne Konok，非常感谢。它工作得很好。谢谢我已经对它进行了测试，并得到了预期的结果。