php - wp_generate_attachment_metadata 返回一个空数组

Question

我正在编写一个 Wordpress 插件来下载我博客上的远程图像。

我做了一个在本地上传远程图片的功能，然后返回它的ID。除了

    $attach_data = wp_generate_attachment_metadata( $attach_id, $local_file );

返回一个空数组 - 它不应该。

wp_generate_attachment_metadata其中，负责生成上传图像的缩略图。但是我在运行代码时没有创建缩略图。

我检查了我发送给函数的值，它们似乎是正确的:我有一个 ID 和一个上传文件的绝对路径，如法典中所述。尽管如此，我还是无法让我的代码正常工作:

$attach_data 不应为空...

有人能帮忙吗？

function upload_from_remote_url($url,$post_id){

    $url = $this->validate_remote_media_url($url); //check file is not on local server
    if (!$url) return false;

    if ($existing_id = $this->media_already_exists($url)) return $existing_id; //url already has been downloaded

    $upload_dir = wp_upload_dir();
    $wp_mime_types = wp_get_mime_types();

    //fetch image
    $response = wp_remote_get( $url );

    //get filename without extension
    $filename = basename( $url ); //get filename & extension
    $filename_strip = preg_replace('/\.[^.]*$/', '', $filename); //strip extension

    //get extension from content type,
    //because wp_upload_bits needs an extension and certain url don't have one.

    $file_type = wp_remote_retrieve_header( $response, 'content-type' );
    $extensions = array_search($file_type,$wp_mime_types);
    $extensions_arr = explode('|',$extensions);
    $extension = $extensions_arr[0];

    $new_filename = $filename_strip.'.'.$extension; //full name
    $new_filename = wp_unique_filename($upload_dir['path'], $new_filename); // be sure this name do not exist already

    $uploaded = wp_upload_bits($new_filename, '', wp_remote_retrieve_body( $response ) );
    if ($uploaded['error']) return false;

    $local_file = $uploaded['file'];
    $local_filename = basename($local_file);
    $local_filetype = wp_check_filetype( $local_filename, null );

    //Attachment options
    $attachment = array(
        'post_title'=> $local_filename,
        'post_mime_type' => $local_filetype,
        'post_status' => 'inherit'
    );

    // Add the image to your media library
    $attach_id = wp_insert_attachment( $attachment, $local_file, $post_id );

    if (!$attach_id) return false;

    $attach_data = wp_generate_attachment_metadata( $attach_id, $local_file );

    wp_update_attachment_metadata( $attach_id, $attach_data );

    //save source link so we do not import several times the same media
    update_post_meta($attach_id, 'grm_source', $url);

    return $attach_id;

}

顺便说一句，如果任何 WP gourou 对这段代码有任何看法......我会很乐意阅读它，因为关于上传文件的 WP 文档有点乱。我在这里需要一些特定的东西，因为能够检索文件扩展名。我结束了这个，但也许你有更好的主意!

Answer 1

我遇到过类似的问题，缺少 MIME 类型。因为我只使用一种 mime 类型，所以它被修复了

'post_mime_type' => 'image/jpeg'

在那之后，它仍然没有更新元数据，但是用“wp_update_attachment_metadata”强制更新解决了问题:

$attach_data = wp_generate_attachment_metadata($attach_id, $file_path);
wp_update_attachment_metadata($attach_id, $attach_data);