将数组键（数字）排序到特定的顺序数组（数字）

Question

I want to change order of following array to 2nd array's values.

Array
(
    [2] => Array
        (
            [title] => Photometric Interpretation
            [name] => photometric_interpretation
        )

    [3] => Array
        (
            [title] => Make
            [name] => make
        )

    [4] => Array
        (
            [title] => Model
            [name] => model
        )

    [5] => Array
        (
            [title] => Strip Offsets
            [name] => strip_offsets
        )

    [6] => Array
        (
            [title] => Samples Per Pixel
            [name] => samples_per_pixel
        )

    [7] => Array
        (
            [title] => Rows Per Strip
            [name] => rows_per_strip
        )
)

I want to change order of above to following array's values.

Array
(
    [0] => 3
    [1] => 4
    [2] => 7
    [3] => 6
    [4] => 5
    [5] => 2
)

What I have tried

$index = array_flip(['3,4,7,6,5,2']);
$assigned_fields = array_merge($fisrt_array, $index);

My desired output is

Array
(

    [3] => Array
        (
            [title] => Make
            [name] => make
        )

    [4] => Array
        (
            [title] => Model
            [name] => model
        )

    [7] => Array
        (
            [title] => Rows Per Strip
            [name] => rows_per_strip
        )

    [6] => Array
        (
            [title] => Samples Per Pixel
            [name] => samples_per_pixel
        )

    [5] => Array
        (
            [title] => Strip Offsets
            [name] => strip_offsets
        )

    [2] => Array
        (
            [title] => Photometric Interpretation
            [name] => photometric_interpretation
        )
)

Answer 1

You need to use array_replace instead of array_merge.

$assigned_fields = array_replace(array_flip($index), $fisrt_array);