pre_comment_author_email is a WordPress PHP filter that allows you to modify the comment author’s email cookie before it is set.
Usage
add_filter('pre_comment_author_email', 'your_custom_function');
function your_custom_function($author_email_cookie) {
// your custom code here
return $author_email_cookie;
}
Parameters
$author_email_cookie(string) – The comment author’s email cookie.
More information
See WordPress Developer Resources: pre_comment_author_email
Examples
Change email domain
Change the email domain of the comment author’s email to a custom domain.
add_filter('pre_comment_author_email', 'change_email_domain');
function change_email_domain($author_email_cookie) {
$email_parts = explode('@', $author_email_cookie);
$email_parts[1] = 'customdomain.com';
return implode('@', $email_parts);
}
Anonymize email
Anonymize the comment author’s email address by replacing the username with “anonymous”.
add_filter('pre_comment_author_email', 'anonymize_email');
function anonymize_email($author_email_cookie) {
$email_parts = explode('@', $author_email_cookie);
$email_parts[0] = 'anonymous';
return implode('@', $email_parts);
}
Add prefix to email
Add a prefix to the comment author’s email address.
add_filter('pre_comment_author_email', 'add_email_prefix');
function add_email_prefix($author_email_cookie) {
$prefix = 'prefix_';
return $prefix . $author_email_cookie;
}
Convert email to lowercase
Convert the comment author’s email address to lowercase.
add_filter('pre_comment_author_email', 'convert_email_to_lowercase');
function convert_email_to_lowercase($author_email_cookie) {
return strtolower($author_email_cookie);
}
Remove subdomain from email
Remove the subdomain from the comment author’s email address.
add_filter('pre_comment_author_email', 'remove_email_subdomain');
function remove_email_subdomain($author_email_cookie) {
$email_parts = explode('@', $author_email_cookie);
$domain_parts = explode('.', $email_parts[1]);
$domain = end($domain_parts);
return $email_parts[0] . '@' . $domain;
}