Another problem with conditional statements

Hi, This should be as simple as breathing, but not today. I have two variables $a and $b which I need to compare in a switch statement in several different ways, but no matter what I do it's wrong. This is what I have tried, can someone tell me how it should be. TIA switch (true): case ($a == $b): This one seems simple enough. do sum stuff; break; case ($a && $b == 124): This appears not to work. do sum stuff; break; case ($a == 124 && $b == 755): If $a is equal to 124 and $b is equal to 755 then it should be true..doesn't work. do sum stuff; break; case ($a == 124 && $b != 124): Nope, this doesn't appear to work either. do sum stuff; break; endswitch;