如何禁用WordPress Flash上传器并强制使用浏览器上传器？求方案及代码

Hey there! Great questions—both are straightforward to solve with a bit of custom code. I’ll break down the solutions clearly, and you can drop these snippets into a custom plugin (highly recommended over editing your theme’s functions.php to avoid losing changes when your theme updates) or your child theme’s functions.php file.

1. Disable the WordPress Flash Uploader #

WordPress used to rely on Flash-based uploaders (like SWFUpload) in older versions, and some legacy plugins/themes might still load them. To fully disable the Flash uploader, we’ll deregister the related scripts so WordPress can’t load them:

// Deregister all Flash uploader-related scripts
function disable_flash_uploader() {
    wp_deregister_script('swfupload');
    wp_deregister_script('swfupload-all');
    wp_deregister_script('swfupload-handlers');
}
add_action('admin_enqueue_scripts', 'disable_flash_uploader');

This code hooks into the admin_enqueue_scripts action to unregister the core Flash uploader scripts. Once added, WordPress won’t load any Flash-based uploader components.

2. Disable Flash Uploader & Force Browser-Native Uploader #

If you want to go a step further and explicitly force WordPress to use the browser’s native uploader (instead of falling back to any alternative), add this filter alongside the previous function:

// Force WordPress to use the browser-native uploader
function force_browser_uploader($use_flash) {
    return false;
}
add_filter('flash_uploader', 'force_browser_uploader');

The flash_uploader filter controls whether WordPress attempts to use Flash for uploads. Returning false tells WordPress to skip Flash entirely and default to the browser’s built-in uploader.

Combined Code Snippet #

Here’s both functions together for convenience:

// Disable Flash Uploader and Force Browser Uploader
function disable_flash_uploader() {
    wp_deregister_script('swfupload');
    wp_deregister_script('swfupload-all');
    wp_deregister_script('swfupload-handlers');
}
add_action('admin_enqueue_scripts', 'disable_flash_uploader');

function force_browser_uploader($use_flash) {
    return false;
}
add_filter('flash_uploader', 'force_browser_uploader');

Important Notes #

• Use a Custom Plugin: Creating a simple custom plugin to hold this code is better than editing your theme’s files—theme updates will overwrite any changes in functions.php.
• Compatibility: This works for most WordPress versions (especially 3.5+, where native uploaders became default). If you’re on an extremely old version, you might need to adjust, but modern installs will handle this perfectly.
• Plugin Conflicts: If you still see the Flash uploader after adding this code, check if a third-party plugin is re-registering the Flash scripts. You can adjust the action priority (add a third parameter like 100 to add_action) to ensure your code runs last.

内容的提问来源于stack exchange，提问作者Amr Elkady