Easiest way to alternate row colors in PHP/HTML?

Question

Here\'s a PHP example of mine. Can anyone find a shorter/easier way to do this?

Answer 1

On a side noe, to alternate between two values a and b, a nice way of doing it in a loop is this:

x = a;
while ( true ) {
    x = a + b - x;
}

You can also do this without addition and subtraction:

x = a ^ b ^ x;

where ^ is the XOR operation.

If you just want to alternate between 0 and 1, you can do this:

x = 0;
while ( true ) {
    x = !x;
}

You could of course use x as an index of colors, CSS style classes and so on.