奇怪！当foldername包含“-cache”时，openZip例程失败

Question

下面的脚本处理.zip文件的上传，提取和传输

我在一个服务器上发生了一个奇怪的问题（目前只有一个），当zip文件包含名为“cache”的文件夹时，服务器会在传输文件之前重置连接。

任何可能导致此问题的想法？将文件夹名称更改为不包含单词“-cache”的任何内容可以解决问题。

有问题的foldername是“gravatar-cache”

<?php

function openZip($file_to_open) {
    global $target;
    global $wp_filesystem;
    if(class_exists('ZipArchive'))
    {
        $zip = new ZipArchive();
        $x = $zip->open($file_to_open);
        if($x === true)
        {
            $zip->extractTo($target);
            $zip->close();
            unlink($file_to_open);
        } else {
            die("There was a problem. Please try again!");
        }
    }
    else
    {
    WP_Filesystem();
    $my_dirs = '';
    _unzip_file_pclzip($file_to_open, $target, $my_dirs);
    unlink($file_to_open);
    }
}

if(isset($_FILES['fupload'])) {
    $filename = $_FILES['fupload']['name'];
    $source = $_FILES['fupload']['tmp_name'];
    $type = $_FILES['fupload']['type'];
    $name = explode('.', $filename);
    global $templateName;
    $templateName = strtolower($name[0]);


        // permission settings for newly created folders
        $chmod = 0755;

    // Ensures that the correct file was chosen
    $accepted_types = array('application/zip','application/x-zip-compressed','multipart/x-zip','application/s-compressed','image/jpeg');

    foreach($accepted_types as $mime_type) {
        if($mime_type == $type)
            {
            $okay = true;
            break;
        }
    }

    //Safari and Chrome don't register zip mime types. Something better could be used here.
    $saved_file_location = $target . $filename;

    if (strtolower($name[1]) =='zip')
    {
        if (move_uploaded_file($source, $saved_file_location))
        {
            //unzip_file($saved_file_location, $target);
            openZip($saved_file_location);
        }
        else
        {
        die();
        }
    }
}