Insert into array at a specified place

Question

array:

A-B-C-D-E-F

J is the son of C. update array so:

A-B-C-J-D-E-F

how do I insert J after C in the arr

Answer 1

I wrote a function to insert into an array at a specified index:

function array_insert(&$arr, $index, $val)
{
    if (is_array($val))
        array_splice($arr, $index, 0, [$index => $val]);
    else
        array_splice($arr, $index, 0, $val);
}

It will also work for multidimensional arrays but only with a numerical key.