array_splice with multidimensional array breaks inserted array

Question

I have the following array structure:

$tpl = [
    'breadcrumbs' => [
        [ 'title' => 'Item Database', 'text' => 'Item Database', 'url' => SITE_DOMAIN.ADMIN_PATH.'/items/' ],
        [ 'title' => $category->name, 'text' => $category->name, 'active' => true ]
    ]
];

I am attempting to insert an element before the last element, so thought I could use array_splice as follows:

if( !is_null($category->category) )
{
    array_splice(
        $tpl['breadcrumbs'],
        1,
        0,
        [ 'title' => $category->category->name, 'text' => $category->category->name, 'url' => SITE_DOMAIN.ADMIN_PATH.'/items/' ]
    );
}

However, this seems to flatten the item I am trying to insert (as per the expected behaviour) and produces the following output:

Array
(
    [0] => Array
        (
            [title] => Item Database
            [text] => Item Database
            [url] => https://local/qmdepot/admin/items/
        )

    [1] => Medical Department
    [2] => Medical Department
    [3] => https://local/qmdepot/admin/items/
    [4] => Array
        (
            [title] => Class 1
            [text] => Class 1
            [active] => 1
        )

)

While the expected output should be:

Array
(
    [0] => Array
        (
            [title] => Item Database
            [text] => Item Database
            [url] => https://local/qmdepot/admin/items/
        )
    [1] => Array
        (
            [title] => Medical Department
            [text] => Medical Department
            [url] => https://local/qmdepot/admin/items/
        )
    [2] => Array
        (
            [title] => Class 1
            [text] => Class 1
            [active] => 1
        )
)

I am able to achieve this using the following code, but it feels a little hacky to me:

# Set up the breadcrumbs:
if( !is_null($category->category) )
{
    $tpl['breadcrumbs'][2] = $tpl['breadcrumbs'][1];
    $tpl['breadcrumbs'][1] = [ 'title' => $category->category->name, 'text' => $category->category->name, 'url' => SITE_DOMAIN.ADMIN_PATH.'/items/' ];
}

Is there any way to insert an array item into a multi-dimensional array at a specified index without writing a custom function or using the hack above?

user3942918 · Accepted Answer · 2018-07-13 12:16:27Z

4

Since the item you want to insert is an array, and array_splice takes an array of items, put your array in an array.

Also since you want to insert something before the last element you can use a negative number for the offset to count backward from the end. (The effect is the same with the data you've got, but matters on arrays of different sizes.)

array_splice(
    $tpl['breadcrumbs'],
    -1,
    0,
    [[ 'title' => $category->category->name, 'text' => $category->category->name, 'url' => SITE_DOMAIN.ADMIN_PATH.'/items/' ]]
);

answered Jul 13, 2018 at 12:16

user3942918

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