How to modify array such that all keys are increased by 1

I have this array

$arr[0] = 'zero'
$arr[1] = 'one'
$arr[2] = 'two'
$arr[3] = 'three'

I want t开发者_StackOverflowo be able to push a value in at a certain point and push the keys which follow this new value up by one so ending up with:

$arr[0] = 'zero'
$arr[1] = 'one'
$arr[2] = 'my new value' //keys before remain the same, keys after are increased by 1
$arr[3] = 'two'
$arr[4] = 'three'

Is there a simple solution which does not involve a foreach or is that my only solution?

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array_splice($array, 2, 0, 'my new value');

http://php.net/array_splice