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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 |
|---|---|
| 668 | extract($commentdata, EXTR_SKIP); |
| 669 | |
| 670 | // Simple duplicate check |
| 671 | // expected_slashed ($comment_post_ID, $comment_author, $comment_author_email, $comment_content) |
| 672 | $dupe = "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = '$comment_post_ID' AND comment_parent = '$comment_parent' AND comment_approved != 'trash' AND ( comment_author = '$comment_author' "; |
| 673 | if ( $comment_author_email ) |
| 674 | $dupe .= "OR comment_author_email = '$comment_author_email' "; |
| 675 | $dupe .= ") AND comment_content = '$comment_content' LIMIT 1"; |
| 676 | if ( $wpdb->get_var($dupe) ) { |
| 677 | do_action( 'comment_duplicate_trigger', $commentdata ); |
| 678 | if ( defined('DOING_AJAX') ) |
| 679 | die( __('Duplicate comment detected; it looks as though you’ve already said that!') ); |
| 680 | |
| 681 | wp_die( __('Duplicate comment detected; it looks as though you’ve already said that!') ); |
| 682 | } |
| 683 | |
| 684 | do_action( 'check_comment_flood', $comment_author_IP, $comment_author_email, $comment_date_gmt ); |
| 685 | |
| 686 | if ( ! empty( $user_id ) ) { |