switch duplicates exactly at 4

[SuperBlue]

I have a switch, which i use to alternate between two numbers. But for some reason, a duplicate occurs exactly at the count of 4, and i haven't been able to figure out why.

 

$Count = 1;

switch ($Count) {
    case 1:
        ++$Count;
        break;
    case 2:
        --$Count;
        break;
}

 

Should output:

2
1
2
1
2
...

But for some reason it gives the below instead..

2
1
2
1
1
2
1
...

 

Subsequent output after the error appears completely normal. 

[rwwd]

Stupid suggestion I Deleted my comment..

[SuperBlue]

I was just a bit to quick when writing the source. The switch was placed the wrong place, so it allowed inclusion of inactive posts, before it calculated the current count.

 

I nearly thought that either PHP, or I got the math wrong..