PHP zerofill number to always have two chars

Question

I want to zerofill a number so that the resulting nunber always has two chars.

For example: 1.7 -> 01.7 34.7 -> 34.6 // Remains the same, already two chars

I tried using printf('%05.1f', 12.2); but this always adds a char to the number no matter what. I only want that to happen when it has only one char (< 10). Also decimals should not be removed.

Answer 1

You should write

printf('%04.1f', 12.2)

because you want your numbers to have at least four characters (including the .)

You may want to check out this: http://alvinalexander.com/programming/printf-format-cheat-sheet#printf_-_floating_point_numbers

Answer 2

You can use if else for that

if($num <10){
  printf('%05.1f', 12.2);
}