WordPress媒体库多类问题求助：上传报错、图片不显示等

Hey there, let's work through these WordPress media library headaches together—they’re frustrating, but we can break them down and fix each one!

You’ve got a few distinct problems here, so let’s tackle them one by one with actionable steps:

1. Fixing Inconsistent HTTP Upload Errors #

The random success/failure pattern (no clear link to image type/size) usually traces back to server limits, conflicting code, or cached issues. Try these:

• Bump PHP resource limits: Access your php.ini file (or use a phpinfo() page to check current values) and make sure these are set to at least:
  • upload_max_filesize = 64M
  • post_max_size = 80M (needs to be larger than upload limit)
  • memory_limit = 256M
  • max_execution_time = 300
    If you can’t edit php.ini, add these lines to your wp-config.php file instead:

  define('WP_MEMORY_LIMIT', '256M');
  @ini_set('upload_max_filesize', '64M');
  @ini_set('post_max_size', '80M');
  @ini_set('max_execution_time', 300);
  

• Isolate conflicting plugins/themes: Deactivate all plugins and switch to a default theme (like Twenty Twenty-Four). If uploads start working, reactivate items one by one to find the culprit.
• Check server security rules: Some hosts use mod_security that blocks certain image uploads. Reach out to your hosting support to review logs or adjust these rules.
• Clear all caches: Corrupted WordPress or browser cache can mess with uploads. Clear your site’s cache (via plugin or hosting panel) and your browser’s cache/cookies.

2. Fixing Image Cropping Errors #

Cropping failures almost always relate to image processing tools or file permissions:

• Verify image processing extensions: WordPress relies on either GD Library or Imagick for cropping. Check your phpinfo() page to confirm one of these is enabled. If not, ask your host to turn it on.
• Fix folder permissions: Make sure your wp-content/uploads folder has permissions set to 755 (for folders) and 644 (for files). You can adjust this via FTP or your hosting file manager.
• Regenerate thumbnails: If cropping fails for existing images, use a tool like Regenerate Thumbnails to refresh all image sizes—corrupted metadata often causes this issue.

3. Making FTP-Uploaded Images Appear in Media Library #

FTP uploads don’t show up automatically because WordPress needs to index them in its database. Here’s how to fix that:

• Use a dedicated plugin: Tools like Add from Server let you scan your uploads folder and add existing files to the media library without re-uploading.
• Manual database registration (advanced): If you avoid plugins, add this snippet temporarily to your theme’s functions.php, run it once, then remove it to avoid duplicates:

  function register_ftp_uploaded_images() {
      $uploads_dir = wp_upload_dir();
      $image_files = glob($uploads_dir['path'] . '/*.{jpg,jpeg,png,gif}', GLOB_BRACE);
      
      foreach ($image_files as $file) {
          $file_name = basename($file);
          $attachment_data = array(
              'post_mime_type' => wp_check_filetype($file_name)['type'],
              'post_title'     => sanitize_file_name($file_name),
              'post_content'   => '',
              'post_status'    => 'inherit'
          );
          wp_insert_attachment($attachment_data, $file);
      }
  }
  add_action('init', 'register_ftp_uploaded_images');
  

4. Debugging the Specific GET Request HTTP Error #

To get to the bottom of that GET error, enable WordPress debugging:
Add these lines to your wp-config.php file:

define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);

This logs errors to wp-content/debug.log. Try uploading the problematic file again, then check the log for detailed messages—this will tell you exactly what’s causing the GET request failure.

内容的提问来源于stack exchange，提问作者Tayeaba Mila