Question

I have an array like this:

$array = [     0 => 'Apple',     2 => 'Orange',     5 => 'Pear',     8 => 'Pear' ] 

Is there a way to fill in the missing indexes with a default value (for example, an empty string or null)?

I’d like to insert new elements into the array at the following keys: 1, 3, 4, 6, 7

My result should be:

[     0 => 'Apple',     1 => '',     2 => 'Orange',     3 => '',     4 => '',     5 => 'Pear',     6 => '',     7 => '',     8 => 'Pear' ] 

Answer 1

This should be faster for larger arrays. For smaller arrays any method will do.

$existingKeys = array_keys($array);  //you can use any value instead of null $newKeys = array_fill_keys(range(min($existingKeys), max($existingKeys)), null); $array += $newKeys;  //optional, probably not needed ksort($array);