求助：移除WordPress注册邮件的用户名与登录URL，代码无效

Let’s work through why your custom registration email isn’t overriding the default one. Here are the most likely fixes and explanations:

1. Boost Your Hook Priority #

Your current code uses the default priority of 10, but other plugins or your theme might be using the same hook with a higher priority (which runs later and overwrites your changes). Try bumping the priority to 20 or higher to ensure your code executes last:

add_filter( 'wp_new_user_notification_email', 'custom_wp_new_user_notification_email', 20, 3 );
function custom_wp_new_user_notification_email( $wp_new_user_notification_email, $user, $blogname ) {
    // Fixed the typo "registerd" to "registered" while we're at it
    $wp_new_user_notification_email['subject'] = sprintf( '[%s] New user %s registered.', $blogname, $user->user_login );
    $wp_new_user_notification_email['message'] = sprintf( "%s ( %s ) has registered to your blog %s.", $user->user_login, $user->user_email, $blogname );
    
    // Optional debug line to confirm your code runs (check wp-content/debug.log later)
    error_log( 'Custom registration email filter ran for user ID: ' . $user->ID );
    
    return $wp_new_user_notification_email;
}

2. Double-Check Where You’re Adding the Code #

Make sure your code is placed in a location that loads properly:

• Your active child theme’s functions.php file (never edit the parent theme directly—updates will erase your changes)
• A custom plugin file (the most reliable option, as it’s independent of theme updates)

If you’re using a parent theme without a child, create a child theme first or use a custom plugin to hold your code.

3. Rule Out Plugin/Theme Conflicts #

Third-party plugins (like membership tools, custom registration forms, or security plugins) often override WordPress’s default registration email system. To test this:

• Disable all plugins except WordPress core
• Switch to a default theme (e.g., Twenty Twenty-Four)
• Register a test user and see if your custom email appears

If it works, re-enable plugins one by one to find the conflicting tool.

4. Confirm WordPress Version Compatibility #

The wp_new_user_notification_email filter was introduced in WordPress 5.5. If you’re running an older version, this hook won’t exist. You have two options:

• Update WordPress to the latest stable version (highly recommended for security and functionality)
• Use the older (deprecated but functional) wp_new_user_notification function override for pre-5.5 versions:

if ( ! function_exists( 'wp_new_user_notification' ) ) {
    function wp_new_user_notification( $user_id, $deprecated = null, $notify = '' ) {
        $user = get_userdata( $user_id );
        $blogname = wp_specialchars_decode( get_option('blogname'), ENT_QUOTES );
        
        // Send custom email to the new user
        $subject = sprintf( '[%s] New user %s registered.', $blogname, $user->user_login );
        $message = sprintf( "%s ( %s ) has registered to your blog %s.", $user->user_login, $user->user_email, $blogname );
        wp_mail( $user->user_email, $subject, $message );
        
        // Optional: Keep sending admin notification if needed
        if ( 'admin' === $notify || empty( $notify ) ) {
            $admin_subject = sprintf( '[%s] New User Registration', $blogname );
            $admin_message = sprintf( "New user %s (%s) registered.", $user->user_login, $user->user_email );
            wp_mail( get_option('admin_email'), $admin_subject, $admin_message );
        }
    }
}

5. Debug with Logs #

Add the error_log() line from the first code snippet, then enable debug logging in wp-config.php by adding:

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

Check the wp-content/debug.log file after registering a user—if you don’t see your debug entry, your code isn’t being loaded at all.

内容的提问来源于stack exchange，提问作者DrMTR