PHP mb_detect_encoding能检测UTF-8吗

是的，PHP的mb_detect_encoding函数可以用来检测字符串的编码格式，包括UTF-8编码。当检测到UTF-8编码时，函数会返回"UTF-8"。示例代码如下：

$text = "你好，世界！";
$encoding = mb_detect_encoding($text, "UTF-8");

if($encoding == "UTF-8"){
    echo "字符串编码为UTF-8";
}else{
    echo "字符串编码不是UTF-8";
}