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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 102 | $commentdata['comment_author_email'] = apply_filters('pre_comment_author_email', $commentdata['comment_author_email']); |
| 103 | $commentdata['filtered'] = true; |
| 104 | return $commentdata; |
| 105 | } |
| 106 | |
| 107 | function wp_allow_comment($commentdata) { |
| 108 | global $wpdb; |
| 109 | extract($commentdata); |
| 110 | |
| 111 | $comment_user_domain = apply_filters('pre_comment_user_domain', gethostbyaddr($comment_author_IP) ); |
| 112 | |
| 113 | // Simple duplicate check |
| 114 | $dupe = "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = '$comment_post_ID' AND ( comment_author = '$comment_author' "; |
| 115 | if ( $comment_author_email ) |
| 116 | $dupe .= "OR comment_author_email = '$comment_author_email' "; |
| 117 | $dupe .= ") AND comment_content = '$comment_content' LIMIT 1"; |
| 118 | if ( $wpdb->get_var($dupe) ) |
| 119 | die( __('Duplicate comment detected; it looks as though you\'ve already said that!') ); |
| 120 | |