As explained in the CB, the memory address wasn't corrupted, the reference was. It was replaced with a string, and modifications were made to that string. This surely occurred because of a missing dereference.

Looking at the code you provided, I see

$logic =  ($cA & $cB & $cC & $cD);
[download]

$logic is assigned a string or a number (depending on the values of $cA, $cB, $cC and $cD), but then you do

$logic->as_string
[download]

Needless to say, the random string or number you created is not an object, and the call fails.

Judging by the value that does end up in $logic, you've got a second problem. $cA, $cB, $cC or $cD contains a object reference, but you're treating it as a bit string. This is what's corrupting the reference.