WordPress上传大小异常：后台显示64MB上限却限制500KB以上文件

Hey Ahmad, let's tackle this frustrating upload size mismatch you're dealing with in WordPress. It’s super common to see the admin dashboard show one limit but hit a stricter actual restriction—here are the most reliable fixes to get your 64MB upload limit working as advertised:

1. Check and Update PHP Configuration (php.ini) #

WordPress pulls its upload limits from your server’s PHP settings, which might be overriding the dashboard’s displayed value. Here’s what to do:

• First, create a temporary phpinfo.php file in your site’s root directory with this code:

  <?php phpinfo(); ?>
  

• Access this file via your browser (e.g., yourdomain.com/phpinfo.php) to find where your php.ini file is stored.
• Open php.ini and adjust these three directives to match (or exceed) the 64MB limit shown in WordPress:
  • upload_max_filesize = 64M
  • post_max_size = 70M (needs to be larger than the upload limit)
  • memory_limit = 128M (gives WordPress enough memory to handle large files)
• Save the file and restart your web server (Apache or Nginx) for changes to take effect.

2. Adjust Settings via .htaccess #

If you don’t have access to php.ini, add these lines to your site’s root .htaccess file (back it up first just in case):

php_value upload_max_filesize 64M
php_value post_max_size 70M
php_value memory_limit 128M
php_value max_execution_time 300

This forces PHP to use the higher limits directly through your server’s configuration file.

3. Check for Plugin/Theme Restrictions #

Security plugins (like Wordfence, iThemes Security) or custom themes often add their own upload limits to prevent malicious files.

• Navigate to your security plugin’s settings and look for "File Upload Restrictions" or similar options—ensure they’re set to at least 64MB.
• Check your theme’s functions.php file for any code that sets upload_max_filesize manually, and adjust or remove it if present.

4. Verify Hosting Control Panel Limits #

If you use cPanel, Plesk, or another hosting control panel:

• Look for tools like "Select PHP Version" or "MultiPHP INI Editor."
• Use these tools to set upload_max_filesize and post_max_size to 64MB or higher.
• If you still hit a wall, your host might have a hard limit in place—reach out to their support team to request an increase.

内容的提问来源于stack exchange，提问作者Ahmad