How to increase by 1 all keys in an array?

Question

What is the simplest solution to increase by 1 all keys in an array?

BEFORE:

$arr[0] = \'a\';
$arr[1] = \'b\';
$arr[2] = \'c\';
         


        

Answer 1

$count = count($arr);
for($i=$count; $i>0; $i--){
    $arr[$i] = $arr[$i-1];
}
unset($arr[0]);