If I want to create an if statement with 2 variables:

```
if ($variable1 && $variable2) {
    // Do something
}

```

And then add another if statement below with only the first variable, how would I do it? Do I only include the one variable like this:

```
else if ($variable1) {
     // Do something
}

```

Or do I need to specify that the first variable is true, not the second? If so, is this correct?

```
if ($variable1 && !$variable2) {
    // Do something
}

```