http://stackoverflow.com/questions/11198221/defining-variabl

<?php
// Tested with https://github.com/leafo/lessphp/tree/21a012ff48b289e3e500ebd7c45ca90d5acbd39c
require "lessc.inc.php";
$less = new lessc;
// Compile example from http://stackoverflow.com/a/11198338/938089
echo $less->compile(<<<FOOD
@red-md:   #232;
@red-dk:   #343;

.setColor(@color) {
    (~"body.@{color}") { background-color: ~"@{@{color}-dk}";
        #container { background-color: ~"@{@{color}-md}";
         p { color: ~"@{@{color}-md}"; }
      }
    }
}
.setColor("red"); // Quotes, or the value is parsed as "#FF0000" instead of "red"
//.setColor("blue"); etc..
FOOD
);

// Will output
//body.red {
//  background-color: #343;
//}
//body.red #container {
//  background-color: #232;
//}
//body.red #container p {
//  color: #232;
//}