嘿，我使用了类似的代码（我还下载了远程图像并上传到WordPress网站）。请看一下：

$image_url = $value;//This is the sanitized image url.
$image = pathinfo($image_url);//Extracting information into array.
$image_name = $image[\'basename\'];
$upload_dir = wp_upload_dir();
$image_data = file_get_contents($image_url);
$unique_file_name = wp_unique_filename($upload_dir[\'path\'], $image_name);
$filename = basename($unique_file_name);
$postarr = array(
    \'post_title\' => $post_title,
    \'post_content\' => $post_content,
    \'post_type\' => \'post\',//or whatever is your post type slug.
    \'post_status\' => \'publish\',
    \'meta_input\' => array(
        //If you have any meta data, that will go here.
    ),
);
$insert_id = wp_insert_post($postarr, true);
if (!is_wp_error($insert_id)) {
    if ($image != \'\') {
        // Check folder permission and define file location
        if (wp_mkdir_p($upload_dir[\'path\'])) {
            $file = $upload_dir[\'path\'] . \'/\' . $filename;
        } else {
            $file = $upload_dir[\'basedir\'] . \'/\' . $filename;
        }
        // Create the image  file on the server
        file_put_contents($file, $image_data);
        // Check image file type
        $wp_filetype = wp_check_filetype($filename, null);
        // Set attachment data
        $attachment = array(
            \'post_mime_type\' => $wp_filetype[\'type\'],
            \'post_title\' => sanitize_file_name($filename),
            \'post_content\' => \'\',
            \'post_status\' => \'inherit\',
        );
        // Create the attachment
        $attach_id = wp_insert_attachment($attachment, $file, $insert_id);
        // Include image.php
        require_once ABSPATH . \'wp-admin/includes/image.php\';
        // Define attachment metadata
        $attach_data = wp_generate_attachment_metadata($attach_id, $file);
        // Assign metadata to attachment
        wp_update_attachment_metadata($attach_id, $attach_data);
        // And finally assign featured image to post
        $thumbnail = set_post_thumbnail($insert_id, $attach_id);
    }
}

基于对相关问题的公认答案，我认为类似的方法可能会奏效。

所以基本上，

获取现有帖子内容get_post_fieldwp_insert_attachment 这将为您提供图像ID，从帖子内容中获取图像大小和altwp_get_attachment_image

$post_id = 1234;
$images = array(\'filename1.png\', \'filename2.png\', ... \'filename10.png\');

// Get post content
$post_content = get_post_field( \'post_content\', $post_id );

// Get the path to the upload directory.
$wp_upload_dir = wp_upload_dir();

foreach($images as $name) {
  $attachment = array(
    \'guid\'=> $wp_upload_dir[\'url\'] . \'/\' . basename( $name ), 
    \'post_mime_type\' => \'image/png\',
    \'post_title\' => \'my description\',
    \'post_content\' => \'my description\',
    \'post_status\' => \'inherit\'
  );

  /**
    * STEP 1
    * add images as attachments to WordPress
    */
  $image_id = wp_insert_attachment($attachment, $name, $post_id);
  // Make sure that this file is included, as wp_generate_attachment_metadata() depends on it.
  require_once( ABSPATH . \'wp-admin/includes/image.php\' );
  // Generate the metadata for the attachment, and update the database record.
  $attach_data = wp_generate_attachment_metadata( $image_id, $name );
  wp_update_attachment_metadata( $image_id, $attach_data );

  /**
    * STEP 2
    * Grab image data from $post_content
    */
  // strpos() + substr() maybe?
  $width = 123;
  $height = 123;
  $alt = \'Hello\';

  /**
    * STEP 3
    * get html markup for image
    */  
  // Let WP generate the html markup for the image, adjust size as needed (thumbnail,medium,large,full,array(width,height))
  $image_html = wp_get_attachment_image( $image_id, array( $width, $height ), false, array( \'alt\' => $alt ) );

  /**
    * STEP 4
    * Replace placeholders in content with img markup
    */
  preg_replace( $pattern, $image_html, $post_content ) // I don\'t understand regex well enough to give an example, so you need to figure it out yourself

  /**
    * OPTIONAL
    * set image as featured
    */
  if ( $name === \'example\' ) {
    set_post_thumbnail( $post_id, $image_id );
  }

}

/**
  * STEP 5
  * Update post content
  */
$post_with_imported_images = array(
  \'ID\'           => $post_id,
  \'post_content\' => $post_content,
);
wp_update_post( $post_with_imported_images );