如果条件，PHP嵌套

What I'm trying to achieve is a nested condition like if ((a = true && b = true) or (c = true && d = true)) {...}. This doesn't seem to be working for me.

To further explain: I have two variables in what we could call a 'top', and two variables in what we could call a 'bottom'. What I need to do is execute code if variables are true in both 'top' and 'bottom'.

To more succinctly illustrate:

if ((t1 = true && b1 = true) or
    (t1 = true && b2 = true) or
    (t2 = true && b1 = true) or
    (t2 = true && b2 = true)
) {
    ...do some stuff...
}

I'm tempted to call it 'conditional statement for lattice problem'... except it isn't really a lattice problem... but it does sort of look like a lattice if you drew it |X| ... s'yeah, you're amazing if you can tell me a good way to do this, and you're super amazing if you can tell me what I ought to call it.

= is used for assignment, == is used to test for equality, === is used to test for equality and equal types. You need to use either == or ===, depending on whether t1, t2, b1, b2 are already boolean or something else. Also the stuff that Adam said, except that or is perfectly valid.

You need to use two equal signs == instead of =. Also, your variables need to have $ in front of them. And your "or" should be ||.

The logic is ok.

It should look like this:

if (($t1 == true && $b1 == true) ||
    ($t1 == true && $b2 == true) ||
    ($t2 == true && $b1 == true) ||
    ($t2 == true && $b2 == true)
) {
    ...do some stuff...
}

change condition

if (($t1 == true && $b1 == true) or
($t1 == true && $b2 == true) or
($t2 == true && $b1 == true) or
($t2 == true && $b2 == true)
)

= is assignment operator == is comparison operator.