Question

The question is simple, let’s suppose that I have an array like:

$array = array(array('bla1' => 'bla1'), array('bla2' => 'bla2'),
    array('bla3' => 'bla3'), array('bla4' => 'bla4'));

Yeah it’s multi-dimensional so I need to set value between e.g. array(‘bla1’ => ‘bla1’) and array(‘bla2’ => ‘bla2’) without erasure.

I was puzzled to find, through all array_ like functions in php how to do this.

So, as any other programmer would do, I wrote the function:

function setArrVal($array, $key, $val) {
  for ($i = count($array) - 1; $i >= $key; $i--) {
    $array[$i + 1] = $array[$i];
  }
  $array[$key] = $val;    
  return $array;
}

Works well.
But still need to do this with php function, is there any way to complete this that way?
I’ve tried array_splice($input, 1, 0, $replacement); – worthless, it’s only working with simple values, not with arrays in array.

Answer 1

You can use array_splice() like so:

$array = array(array('bla1' => 'bla1'), array('bla2' => 'bla2'),
    array('bla3' => 'bla3'), array('bla4' => 'bla4'));

$insert = array(array('bla2.5' => 'bla2.5'));

// note the third argument argument is 0
// this will prevent it from overwriting existing values
array_splice($array, 2, 0, $insert ); 

print_r($array);

/* Result */
Array
(
    [0] => Array
        (
            [bla1] => bla1
        )

    [1] => Array
        (
            [bla2] => bla2
        )

    [2] => Array
        (
            [bla2.5] => bla2.5
        )

    [3] => Array
        (
            [bla3] => bla3
        )

    [4] => Array
        (
            [bla4] => bla4
        )

)

Demo: http://codepad.org/ivBmZRdn

Is this what you wanted?