以编程方式为 WooCommerce 中的产品添加更多可下载文件

Question

我正在尝试在 woocommerce 产品中再上传一个可下载文件。我的产品中已有一个可下载文件，想再添加一个。

为此，我使用以下代码：

if($_FILES){
$attachment_id = media_handle_upload( 'abe_update_epub', $post_id );
    if ( is_wp_error( $attachment_id ) ) {
        $errors = $attachment_id->get_error_messages();
        foreach( $errors as $error ){
            echo $error;
        }
    echo 'There was an error uploading the image';
    } else {
    // to get exiting file/Old file
    $abe_file = get_post_meta($abe_post_id, '_downloadable_files', true);
        foreach($abe_file as $abe){
            $name = $abe['name'];
            $url = $abe['file'];
        }
    // This is my new file which i want to upload also
        $file_name = 'Epub Files';
        $file_url1 = wp_get_attachment_url($attachment_id);
        $files[md5( $file_url )] = array(
            'name' => $file_name,
            'file' => $file_url
        );
        update_post_meta( $post_id, '_downloadable_files', $files );
        echo 'The image was uploaded successfully!';
    }
}

此功能以正确的方式上传文件，但它用新文件替换旧文件。

我该如何解决这个问题？
我在这个脚本中做错了什么？

谢谢

Answer 1

update_post_meta 整体重写 meta。

您应该在新数组中加入旧数据 ($abe_file) 和新数据 ($file) 并使用 update_post_meta.

写入它

Answer 2

— Definitive Update 3

There was a lot of mistakes in your code:

In your code there is 2 mistakes in get_post_meta() function:
- Replaced undefined $abe_post_id by defined $post_id. - Removed third argument "true" as it's an array (NOT a string).

The outputted array of $abe_file is a tri-dimensional array with a structure similar to this example:
array( 
    0 => array(
        "67f3fe902b6c55ac07b92ac804d1a9c8" => array(
            "name" => "filename1"
            "file" => "http://www.domain.tld/wp-content/uploads/woocommerce_uploads/2016/09/file1.pdf"
        ),
        "95ce074e798b2e9d6d0d4cbce02f0497" => array(
            "name" => "filename2"
            "file" => "http://www.domain.tld/wp-content/uploads/woocommerce_uploads/2016/09/file2.pdf"
        )
    )
);

您不需要像以前那样在 foreach 循环中迭代此数组，因为您只想将新文件插入其中。您必须确保 $post_id 是您产品的 ID（因为 $abe_post_id 未定义）...

这是有效的更新代码：

if($_FILES){
$attachment_id = media_handle_upload( 'abe_update_epub', $post_id );
    if ( is_wp_error( $attachment_id ) ) {
        $errors = $attachment_id->get_error_messages();
        foreach( $errors as $error ){
            echo $error;
        }
        echo 'There was an error uploading the image';
    } else {

        // Get exiting array of downloadable files. IMPORTANT:
        // 1) => Removed "true" condition as it's an array (ot a string)
        // 2) => As "$abe_post_id" is not defined, I have replace it with "$post_id"
        $abe_file = get_post_meta($post_id, '_downloadable_files'); // removed "true"

        // NEW FILE: Setting the name, getting the url and and Md5 hash number
        $file_name = 'Epub Files';
        $file_url  = wp_get_attachment_url($attachment_id);
        $md5_num = md5( $file_url );

        // Inserting new file in the exiting array of downloadable files
        $abe_file[0][$md5_num] = array(
            'name'   =>  $file_name,
            'file'   =>  $file_url
        );

        // Updating database with the new array
        update_post_meta( $post_id, '_downloadable_files', $abe_file[0] );

        // Displaying a success notice
        echo 'The image was uploaded successfully!';
    }
}

以编程方式为 WooCommerce 中的产品添加更多可下载文件

Adding programatically more downloadable files for products in WooCommerce

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