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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 |
|---|---|
| 764 | |
| 765 | // Merge old and new fields with new fields overwriting old ones. |
| 766 | $commentarr = array_merge($comment, $commentarr); |
| 767 | |
| 768 | $commentarr = wp_filter_comment( $commentarr ); |
| 769 | |
| 770 | // Now extract the merged array. |
| 771 | extract($commentarr, EXTR_SKIP); |
| 772 | |
| 773 | $comment_content = apply_filters('comment_save_pre', $comment_content); |
| 774 | |
| 775 | $comment_date_gmt = get_gmt_from_date($comment_date); |
| 776 | |
| 777 | $wpdb->query( |
| 778 | "UPDATE $wpdb->comments SET |
| 779 | comment_content = '$comment_content', |
| 780 | comment_author = '$comment_author', |
| 781 | comment_author_email = '$comment_author_email', |
| 782 | comment_approved = '$comment_approved', |