Convert HTML hex colours to RGB

Simple function to convert HTML hex colors to RGB:

function html2rgb($color,$returnstring=false){
    if ($color[0] == '#') 
       $color = substr($color, 1);
    if (strlen($color) == 6)
       list($r, $g, $b) = array($color[0].$color[1],
                                 $color[2].$color[3],
                                 $color[4].$color[5]);
    elseif (strlen($color) == 3)
        list($r, $g, $b) = array($color[0].$color[0], $color[1].$color[1], $color[2].$color[2]);
    else
        return false;
    //$key = 1/255; // use this to get a range from 0 to 1 eg: (0.5, 1, 0.1)
    $key = 1; // use this for normal range 0 to 255 eg: (0, 255, 50)
    $r = hexdec($r)*$key;
    $g = hexdec($g)*$key;
    $b = hexdec($b)*$key;
    if($returnstring){
        return "{rgb $r $g $b}";
    }else{
        return array($r, $g, $b);
    }
}