PHP If Statement with Multiple Conditions

I have a variable$var.

I want echo "true" if $var is equal to any of the following values abc, def, hij, klm, or nop. Is there a way to do this with a single statement like &&??


An elegant way is building an array on the fly and using in_array():

if (in_array($var, array("abc", "def", "ghi")))

The switch statement is also an alternative:

switch ($var) {
case "abc":
case "def":
case "hij":
    echo "yes";
    break;
default:
    echo "no";
}

if($var == "abc" || $var == "def" || ...)
{
    echo "true";
}

Using "Or" instead of "And" would help here, i think