无插件实现WordPress彩色标签云。将代码复制到主题function.php文件中即可。其中rand(888,888888)可通过修改数字，修改为自己想要的颜色区间。
// 实现彩色标签云
function colorCloud($text) {
$text = preg_replace_callback('|<a (.+?)>|i', 'colorCloudCallback', $text);
return $text;
}
function colorCloudCallback($matches) {
$text = $matches[1];
$color = dechex(rand(888,888888));
$pattern = '/style=(\'|\")(.*)(\'|\")/i';
$text = preg_replace($pattern, "style=\"color:#{$color};$2;\"", $text);
return "<a $text>";
}
add_filter('wp_tag_cloud', 'colorCloud', 1);