无法使用ZipArchive在ZIP内保存文件

Question

我已经阅读了许多类似的问题，但是我找不到我的解决方案。

我需要做的是将POST变量中的文件压缩为数组，并获取刚刚创建的zip文件的路径。这是我的代码...我不断收到一个空对象，只是无法在其中创建1个文件

function downloadAllImages(){
    $data = array();
    $files = $_POST['files_to_download'];

    $archive_file_name = 'images.zip';
    $zip = new ZipArchive();
    //create the file and throw the error if unsuccessful
    if ($zip->open($archive_file_name, ZIPARCHIVE::CREATE )!==TRUE) {
        $data['debug'].=("cannot open <$archive_file_name>\n");
    }
    //add each files of $file_name array to archive
    foreach($files as $file)
    {
        $zip->addFile($file, basename($file));
    }
    $zip->close();
    //then send the headers to foce download the zip file
    header("Content-type: application/zip"); 
    header("Content-Disposition: attachment; filename=$archive_file_name"); 
    header("Pragma: no-cache"); 
    header("Expires: 0"); 
    readfile("$archive_file_name");
    $data['debug'].=print_r($zip,true);
    echo json_encode($data);
    die(); 
}

压缩文件后，我正在使用JQuery获取下载链接。我只是无法将文件压缩。

[files_to_download数组打印：

    Array(
    [0] => http://localhost/br/wp-content/uploads/2020/04/rabbit-black-transp-300x300.png
    [1] => http://localhost/br/wp-content/uploads/2020/04/bg-shop-300x169.png
    )

还有我的jQuery

function downloadAllImages(){
    var files_to_download = [];
    $("img.downloadable").each(function(){
        files_to_download.push($(this).attr('src'));
    });
    jQuery.ajax({  
        url: runAJAX.ajaxurl,
        data: ({action: 'downloadAllImages', files_to_download:files_to_download}),
        method: "POST",
        success: function(data_received) {
            displayAjaxResponse(data_received);
        }
    }); 
}

Answer 1

最后，我的一个朋友提供了帮助，PHP代码应如下所示：

function downloadAllImages()
{
    $data = array();
    $files = $_POST['files_to_download']; // array
    $domain= wp_upload_dir();
    // used this to rename the file so each post gets it's own zip
    $prefix=$_POST['file_prefix']; 
    $zip = new ZipArchive();
    $tmp_zip = $zip->open($domain['basedir'].'/'.$prefix.'images.zip', ZipArchive::CREATE);
    foreach($filesas $img)
    {
        if(!empty($img))
        {
          $download_file = file_get_contents($img);
          $zip->addFromString(basename($img), $download_file);
        }

    }
    $zip->close();
    $now = new DateTime();
    $data['file'] = get_bloginfo('wpurl')."/wp-content/uploads/{$prefix}images.zip?v={$now ->getTimestamp()}";
    echo json_encode($data);
    die();
}

和jQuery看起来几乎一样，除了添加了'file_prefix'变量。