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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 |
|---|---|
| 184 | |
| 185 | // Simple duplicate check |
| 186 | $dupe = "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = '$comment_post_ID' AND ( comment_author = '$comment_author' "; |
| 187 | if ( $comment_author_email ) |
| 188 | $dupe .= "OR comment_author_email = '$comment_author_email' "; |
| 189 | $dupe .= ") AND comment_content = '$comment_content' LIMIT 1"; |
| 190 | if ( $wpdb->get_var($dupe) ) |
| 191 | wp_die( __('Duplicate comment detected; it looks as though you\'ve already said that!') ); |
| 192 | |
| 193 | do_action( 'check_comment_flood', $comment_author_IP, $comment_author_email, $comment_date_gmt ); |
| 194 | |
| 195 | if ( $user_id ) { |
| 196 | $userdata = get_userdata($user_id); |
| 197 | $user = new WP_User($user_id); |
| 198 | $post_author = $wpdb->get_var("SELECT post_author FROM $wpdb->posts WHERE ID = '$comment_post_ID' LIMIT 1"); |
| 199 | } |
| 200 | |
| 201 | if ( $userdata && ( $user_id == $post_author || $user->has_cap('level_9') ) ) { |
| 202 | // The author and the admins get respect. |