php 解压zip 乱码怎么办

<?php
$zip = new \ZipArchive;
$zipfile = "./test.zip";
$res = $zip->open($zipfile);
$toDir = "./test";
$s = $zip->extractTo($toDir);
print_r(scandir($toDir));

<?php
$zip = new \ZipArchive;
$zipfile = "./test.zip";
$res = $zip->open($zipfile);
$toDir = "./test";
if(!file_exists($toDir)) {
   mkdir($toDir);
}
$docnum = $zip->numFiles;
for($i = 0; $i < $docnum; $i++) {
   $statInfo = $zip->statIndex($i);
   if($statInfo[&#39;crc&#39;] == 0) {
       //新建目录
       mkdir($toDir.&#39;/&#39;.substr($statInfo[&#39;name&#39;], 0,-1));
   } else {
       //拷贝文件
       copy(&#39;zip://&#39;.$zipfile.&#39;#&#39;.$statInfo[&#39;name&#39;], $toDir.&#39;/&#39;.$statInfo[&#39;name&#39;]);
   }
}
print_r(scandir($toDir));