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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 |
|---|---|
| 463 | $user_id = apply_filters('pre_user_id', $user_ID); |
| 464 | $author = apply_filters('pre_comment_author_name', $comment_author); |
| 465 | $email = apply_filters('pre_comment_author_email', $comment_author_email); |
| 466 | $url = apply_filters('pre_comment_author_url', $comment_author_url); |
| 467 | $comment = apply_filters('pre_comment_content', $comment_content); |
| 468 | $comment = apply_filters('post_comment_text', $comment); // Deprecated |
| 469 | $comment = apply_filters('comment_content_presave', $comment); // Deprecated |
| 470 | |
| 471 | $user_ip = apply_filters('pre_comment_user_ip', $_SERVER['REMOTE_ADDR']); |
| 472 | $user_domain = apply_filters('pre_comment_user_domain', gethostbyaddr($user_ip) ); |
| 473 | $user_agent = apply_filters('pre_comment_user_agent', $_SERVER['HTTP_USER_AGENT']); |
| 474 | |
| 475 | $now = current_time('mysql'); |
| 476 | $now_gmt = current_time('mysql', 1); |
| 477 | |
| 478 | if ( $user_id ) { |
| 479 | $userdata = get_userdata($user_id); |
| 480 | $post_author = $wpdb->get_var("SELECT post_author FROM $wpdb->posts WHERE ID = '$comment_post_ID' LIMIT 1"); |
| 481 | } |