How to change array indexes in php?

Question

array(
      [0]=>1
      [1]=>2
      [2]=>3
      [3]=>4
)

If delete second element, you have

array(
      [0]=>1
      [2]=>3
      [3]=>4
)

Now how to change indexes to

array(
      [0]=>1
      [1]=>3
      [2]=>4
)

Answer 1

If you want to re-index your array starting to zero, simply do the following:

$myNewArray = array_values($myOldArry);

Answer 2

From the php docs: http://php.net/manual/en/function.array-splice.php

array_splice: Removes the elements designated by offset and length from the input array, and replaces them with the elements of the replacement array, if supplied.

So, you would use:

$arr = array(1,2,3,4);
array_splice($arr, 2, 1); //Will give you an array: [1, 2, 4]