Using WordPress ‘author_email’ PHP filter

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The author_email WordPress PHP filter modifies the comment author’s email address for display.

Usage

add_filter('author_email', 'your_custom_function', 10, 2);

function your_custom_function($author_email, $comment_id) {
    // your custom code here
    return $author_email;
}

Parameters

  • $author_email (string) – The comment author’s email address.
  • $comment_id (string) – The comment ID as a numeric string.

More information

See WordPress Developer Resources: author_email

Examples

Anonymize email addresses

Anonymize the email addresses of comment authors by replacing them with a generic email.

add_filter('author_email', 'anonymize_comment_author_email', 10, 2);

function anonymize_comment_author_email($author_email, $comment_id) {
    return '[email protected]';
}

Add a domain to email addresses

Add a specific domain to email addresses if they don’t already have one.

add_filter('author_email', 'add_domain_to_email', 10, 2);

function add_domain_to_email($author_email, $comment_id) {
    if (!strpos($author_email, '@')) {
        $author_email .= '@example.com';
    }
    return $author_email;
}

Replace specific email addresses

Replace specific email addresses with a custom email.

add_filter('author_email', 'replace_specific_email', 10, 2);

function replace_specific_email($author_email, $comment_id) {
    if ($author_email === '[email protected]') {
        $author_email = '[email protected]';
    }
    return $author_email;
}

Uppercase all email addresses

Convert all email addresses to uppercase.

add_filter('author_email', 'uppercase_email', 10, 2);

function uppercase_email($author_email, $comment_id) {
    return strtoupper($author_email);
}

Remove special characters from email addresses

Remove special characters (e.g., ‘+’ and ‘.’) from email addresses.

add_filter('author_email', 'remove_special_chars', 10, 2);

function remove_special_chars($author_email, $comment_id) {
    $author_email = str_replace(['+', '.'], '', $author_email);
    return $author_email;
}