WordPress で色付きのタグクラウドを実装する方法

function getColorByScale($scale_color, $min_color, $max_color)

$scale_color = $scale_color / 100; 
$minr = hexdec(substr($min_color, 1, 2)); 
$ming = hexdec(substr($min_color, 3, 2)); 
$minb = hexdec(substr($min_color, 5, 2)); 
$maxr = hexdec(substr($max_color, 1, 2)); 
$maxg = hexdec(substr($max_color, 3, 2)); 
$maxb = hexdec(substr($max_color, 5, 2)); 
$r = dechex(intval((($maxr - $minr) * $scale_color) + $minr)); 
$g = dechex(intval((($maxg - $ming) * $scale_color) + $ming)); 
$b = dechex(intval((($maxb - $minb) * $scale_color) + $minb));

//Colorful Tag Cloud start 
$r = dechex(rand(0,255)); 
$g = dechex(rand(0,196)); 
$b = dechex(rand(0,255));