Question

What do I have to write in the cases (of switch function in PHP) to make if $number > 0 && $number < 15?

I tried with:

<?php
    $number = rand("0","100");
    switch($number) {
        case: $number > 0 && $number < 15;
            $output = 1;
            break;
        case: $number > 15 && $number < 50;
            $output = 2;
            break;
    }
    return $output;
?>

Answer 1

Try the following. Your colons were in the wrong place!

<?php
  $number = rand("0", "100");
  switch(true) {
    case $number > 0 && $number < 15:
      $output = 1;
      break;
    case $number > 15 && $number < 50:
      $output = 2;
      break;
  }
?>

From the comment by DaveRandom below. Be aware that nothing will happen if $number is equal to 15. I would recommend changing one of your switch statements. Perhaps by changing your first case into:

   case $number > 0 && $number <= 15: