Description:
------------
This code fails, 0 gets ignored and is catch by the 2nd case instead of the first one. Basically indicating than 0 is greater that 69. To evaluate a lower value you need to set it up to 1.

$a = 0;

switch ($a){
  case ($a <= 69) : echo "Less than or equal 69"; break;
  case ($a > 69 && $a < 80)  : echo "greater than 69"      ; break;
  case ($a >= 80) : echo "greater or equal 80"  ; break;
}

Test script:
---------------
This code fails, 0 gets ignored and is catch by the 2nd case instead of the first one. Basically indicating than 0 is greater that 69. To evaluate a lower value you need to set it up to 1.

$a = 0;

switch ($a){
  case ($a <= 69) : echo "Less than or equal 69"; break;
  case ($a > 69 && $a < 80)  : echo "greater than 69"      ; break;
  case ($a >= 80) : echo "greater or equal 80"  ; break;
}

Expected result:
----------------
It should evaluate 0 as a value and it is not.