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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 |
|---|---|
| 720 | else |
| 721 | $excerpt = apply_filters('the_excerpt', $post->post_excerpt); |
| 722 | $excerpt = str_replace(']]>', ']]>', $excerpt); |
| 723 | $excerpt = strip_tags($excerpt); |
| 724 | if ( function_exists('mb_strcut') ) // For international trackbacks |
| 725 | $excerpt = mb_strcut($excerpt, 0, 252, get_settings('blog_charset')) . '...'; |
| 726 | else |
| 727 | $excerpt = substr($excerpt, 0, 252) . '...'; |
| 728 | |
| 729 | $post_title = apply_filters('the_title', $post->post_title); |
| 730 | $post_title = strip_tags($post_title); |
| 731 | |
| 732 | if ($to_ping) : foreach ($to_ping as $tb_ping) : |
| 733 | $tb_ping = trim($tb_ping); |
| 734 | if ( !in_array($tb_ping, $pinged) ) { |
| 735 | trackback($tb_ping, $post_title, $excerpt, $post_id); |
| 736 | $pinged[] = $tb_ping; |
| 737 | } else { |
| 738 | $wpdb->query("UPDATE $wpdb->posts SET to_ping = TRIM(REPLACE(to_ping, '$tb_ping', '')) WHERE ID = '$post_id'"); |