将数字转换为字母

Question

I have digit string and convert into letters.

$arr = str_split('12345');
Array
 (
  [0] => 1
  [1] => 2
  [2] => 3
  [3] => 4
  [4] => 5
 )

Now I want to Convert 1 = A, 2 = B, ...

Answer 1

Easiest solution I can think of right now:

$arr = str_split('12345');
$arr2 = str_split('abcdefghijklmnopqrstuvwxyz');

foreach($arr as &$digit)
    $digit = $arr2[$digit-1];

note that $digit is passed to the loop by reference using a & symbol. That means that when you manipulate $digit, the respective array entry in $arr will be changed as well.