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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 |
|---|---|
| 812 | |
| 813 | // Merge old and new fields with new fields overwriting old ones. |
| 814 | $commentarr = array_merge($comment, $commentarr); |
| 815 | |
| 816 | $commentarr = wp_filter_comment( $commentarr ); |
| 817 | |
| 818 | // Now extract the merged array. |
| 819 | extract(stripslashes_deep($commentarr), EXTR_SKIP); |
| 820 | |
| 821 | $comment_content = apply_filters('comment_save_pre', $comment_content); |
| 822 | |
| 823 | $comment_date_gmt = get_gmt_from_date($comment_date); |
| 824 | |
| 825 | $wpdb->query( $wpdb->prepare("UPDATE $wpdb->comments SET |
| 826 | comment_content = %s, |
| 827 | comment_author = %s, |
| 828 | comment_author_email = %s, |
| 829 | comment_approved = %s, |
| 830 | comment_author_url = %s, |