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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 |
|---|---|
| 670 | extract($commentdata, EXTR_SKIP); |
| 671 | |
| 672 | // Simple duplicate check |
| 673 | // expected_slashed ($comment_post_ID, $comment_author, $comment_author_email, $comment_content) |
| 674 | $dupe = $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_parent = %s AND comment_approved != 'trash' AND ( comment_author = %s ", wp_unslash( $comment_post_ID ), wp_unslash( $comment_parent ), wp_unslash( $comment_author ) ); |
| 675 | if ( $comment_author_email ) |
| 676 | $dupe .= $wpdb->prepare( "OR comment_author_email = %s ", wp_unslash( $comment_author_email ) ); |
| 677 | $dupe .= $wpdb->prepare( ") AND comment_content = %s LIMIT 1", wp_unslash( $comment_content ) ); |
| 678 | if ( $wpdb->get_var($dupe) ) { |
| 679 | do_action( 'comment_duplicate_trigger', $commentdata ); |
| 680 | if ( defined('DOING_AJAX') ) |
| 681 | die( __('Duplicate comment detected; it looks as though you’ve already said that!') ); |
| 682 | |
| 683 | wp_die( __('Duplicate comment detected; it looks as though you’ve already said that!') ); |
| 684 | } |
| 685 | |
| 686 | do_action( 'check_comment_flood', $comment_author_IP, $comment_author_email, $comment_date_gmt ); |
| 687 | |
| 688 | if ( ! empty( $user_id ) ) { |