Capitalize last letter of a string

Question

How can I capitalize only the last letter of a string.

For example:

hello

becomes:

hellO

Answer 1

Convoluted but fun:

echo strrev(ucfirst(strrev("hello")));

Demo: http://ideone.com/7QK5B

as a function:

function uclast($str) {
    return strrev(ucfirst(strrev($str)));
}

Answer 2

When $s is your string (Demo):

$s[-1] = strtoupper($s[-1]);

Or in form of a function:

function uclast(string $s): string
{
  $s[-1] = strtoupper($s[-1]);
  return $s;
}

And for your extended needs to have everything lower-case except the last character explicitly upper-case:

function uclast(string $s): string
{
  if ("" === $s) {
    return $s;
  }

  $s = strtolower($s);
  $s[-1] = strtoupper($s[-1]);

  return $s;
}

Answer 3

There are two parts to this. First, you need to know how to get parts of strings. For that, you need the substr() function.

Next, there is a function for capitalizing a string called strtotupper().

$thestring="Testing testing 3 2 1. aaaa";
echo substr($thestring, 0, strlen($thestring)-2) . strtoupper(substr($thestring, -1));