Multiple comparison operators for one variable?

Question

I need to do multiple checks for a variable. I've seen an "Equals" example, here: w3schools. But they are two different variables. Right now I have:

if ($color == 'blue')
{
//do something
}

But I need to to multiple checks for $color. Eg if it equals red or green too. How is this written?

Answer 1

As simple as:

if ($color == 'blue' || $color == 'red' || $color == 'green') {
    //do something
}

There are several other options. Using switch operator:

switch ($color) {
    case 'blue':
    case 'red':
    case 'green':
        //do something
}

Or more complex using in_array function:

$colors = array('blue', 'red', 'green');
if (in_array($color, $colors)) {
    //do something
}