PHP字符串去除重复值

//explode(',',$data)将字符串已,拆分组成数组
//array_unique() 数组去除重复值
//implode(',',$data))) 将数组用,拆分组合成字符串
$data = "xiaomi,xiaohong,xiaogang,xiaomi,xiaohu";
$data = implode(',',array_unique(explode(',',$data))); 
echo $data;
//结果是$data="xiaomi,xiaohong,xiaogang,xiaohu";