php转换字符编码为utf-8

有个需求，把文件夹下的所有HTML文件读取名字，并展示在后台页面 ``` $_filelist = scandir(dirname(APP_PATH).'/public/doc'); foreach ($_filelist as $key => $value) { $tmp = pathinfo($value); if($tmp['extension'] == 'html') { $filelist[] = array('url'=>$value, 'name'=>str_replace('.html', '', $value)); } } ``` 但是这种写法，在后台展示的都是乱码，考虑到读取出来的文件名不一定是UTF8，需要转换编码 转换编码函数 ``` function strToUtf8($str){ $encode = mb_detect_encoding($str, array("ASCII",'UTF-8',"GB2312","GBK",'BIG5')); if($encode == 'UTF-8'){ return $str; }else{ return mb_convert_encoding($str, 'UTF-8', $encode); } } ```