The comment_save_pre WordPress PHP filter allows you to modify the comment content before it is saved in the database.
Usage
add_filter('comment_save_pre', 'your_custom_function');
function your_custom_function($comment_content) {
// your custom code here
return $comment_content;
}
Parameters
$comment_content(string): The content of the comment being saved.
More information
See WordPress Developer Resources: comment_save_pre
Examples
Remove HTML tags from comment content
Remove any HTML tags from the comment content before saving it to the database.
add_filter('comment_save_pre', 'remove_html_tags_from_comments');
function remove_html_tags_from_comments($comment_content) {
$comment_content = strip_tags($comment_content);
return $comment_content;
}
Replace bad words with asterisks
Replace a list of bad words with asterisks in the comment content before saving it.
add_filter('comment_save_pre', 'replace_bad_words');
function replace_bad_words($comment_content) {
$bad_words = array('badword1', 'badword2', 'badword3');
$replacement = '****';
$comment_content = str_replace($bad_words, $replacement, $comment_content);
return $comment_content;
}