Hypothetical Case-When.php

case (n)
{
  when 0:
    echo "You typed zero.";
  when 1:
  when 4:
  when 9:
    echo "n is a perfect square.";
  when 2:
    echo "n is an even number.";
    fallthru;
  when 3:
  when 5:
  when 7:
    echo "n is a prime number.";
    fallthru;
  when 6:
  when 8:
    echo "n is an even number.";
  default:
    echo "Only single-digit numbers are allowed.";
}