使用 URL 中的图像作为帖子缩略图

Question

我想使用 URL 中的外部图像作为帖子缩略图，但是 我不想下载该图像并将其存储在我的服务器中。

我在其他问题中找到了这段代码：

    $filename = "thumbnail_".$post_id".jpg";
    $upload_file = wp_upload_bits( $filename, null, @file_get_contents('http://example.com/image.jpg') );
 
    if ( ! $upload_file['error'] ) {
      $filename = $upload_file['file'];
      $wp_filetype = wp_check_filetype($filename, null );
      
      $attachment = array(
        'post_mime_type' => $wp_filetype['type'],
        'post_parent'    => $post_id,
        'post_title'     => preg_replace( '/\.[^.]+$/', '', $filename ),
        'post_content'   => '',
        'post_status'    => 'inherit'
      );
     
      $attachment_id = wp_insert_attachment( $attachment, $filename, $post_id );
      file_put_contents('attachment_id.txt', print_r($attachment_id, true));

      if ( ! is_wp_error( $attachment_id ) ) {
          require_once(ABSPATH . 'wp-admin/includes/image.php');

          $attachment_data = wp_generate_attachment_metadata( $attachment_id, $filename );
          wp_update_attachment_metadata( $attachment_id, $attachment_data );
          set_post_thumbnail( $post_id, $attachment_id );
      }
    }

它将图像下载到我的服务器，并在我的上传目录中复制图像文件（我不知道为什么）

但是我不想下载图片我该如何实现呢？

Answer 1

假设此图像只是特色图像的替代 - 您可以将图像源的 URL 存储在自定义字段中。

add_post_meta( $post_id, 'image', 'http://example.com/image.jpg' );

然后您可以在任何需要的地方检索此 URL。

Answer 2

我还没有测试过这个，但假设你总是想要相同的文件，这可能会帮助你开始：

$filepath = 'http://example.com/'; //Change this to the actual file path...
$filename = 'image.jpg'; //Change this to the actual file name...
$filetype = wp_check_filetype( basename( $filename ), null );
$attachment = array(
    'guid'              => $filepath . $filename,
    'post_mime_type'    => $filetype['type'],
    'post_parent'       => $post_id,
    'post_title'        => preg_replace( '/\.[^.]+$/', '', $filename ),
    'post_content'      => '',
    'post_status'       => 'inherit'
);
$attachment_id = wp_insert_attachment( $attachment, $filename, $post_id );
if( !is_wp_error( $attachment_id ) ) {
    require_once(ABSPATH . 'wp-admin/includes/image.php');
    $attachment_data = wp_generate_attachment_metadata( $attachment_id, $filename );
    wp_update_attachment_metadata( $attachment_id, $attachment_data );
    set_post_thumbnail( $post_id, $attachment_id );
}

Answer 3

如果您想在帖子中附加 URL 图像，请使用此（我假设您有

$post_id

）：

if ($post_id) {

    $image_name = basename($post_thumbnail_url);
    $name = explode('.', $image_name)[0];
    $upload_dir = wp_upload_dir();
    $upload_dir_path = $upload_dir['path'];
    $image_name = basename($post_thumbnail_url);
    $image_path = $upload_dir_path . '/' . $image_name;
    $image_data = file_get_contents($post_thumbnail_url);
    if (file_put_contents($image_path, $image_data) !== FALSE) {
        $image_url = $upload_dir['url'] . '/' . $image_name;
    }
    $type = wp_check_filetype($post_thumbnail_url)['type'];
    $attachment = array(
        'guid' => $image_url,
        'post_mime_type' => $type,
        'post_status' => 'inherit',
        'post_title' => $name,
        'post_parent' => $post_id

    );

    $attachment_id = wp_insert_attachment($attachment, $image_path, $post_id);
    if ($attachment_id) {
        $attachment_data = wp_generate_attachment_metadata($attachment_id, $image_path);
        wp_update_attachment_metadata($attachment_id, $attachment_data);
        set_post_thumbnail($post_id, $attachment_id);
    } else {
        wp_send_json_error(array('message' => 'Error While generating post attachment'));
        wp_die();
    }
} else {
    wp_send_json_error(array('message' => 'Error While importing Posts'));
    wp_die();
}