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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 |
|---|---|
| 701 | return; |
| 702 | if (empty($post->post_excerpt)) |
| 703 | $excerpt = apply_filters('the_content', $post->post_content); |
| 704 | else |
| 705 | $excerpt = apply_filters('the_excerpt', $post->post_excerpt); |
| 706 | $excerpt = str_replace(']]>', ']]>', $excerpt); |
| 707 | $excerpt = strip_tags($excerpt); |
| 708 | $excerpt = substr($excerpt, 0, 252) . '...'; |
| 709 | |
| 710 | $post_title = apply_filters('the_title', $post->post_title); |
| 711 | $post_title = strip_tags($post_title); |
| 712 | |
| 713 | if ($to_ping) : foreach ($to_ping as $tb_ping) : |
| 714 | $tb_ping = trim($tb_ping); |
| 715 | if ( !in_array($tb_ping, $pinged) ) { |
| 716 | trackback($tb_ping, $post_title, $excerpt, $post_id); |
| 717 | $pinged[] = $tb_ping; |
| 718 | } else { |
| 719 | $wpdb->query("UPDATE $wpdb->posts SET to_ping = TRIM(REPLACE(to_ping, '$tb_ping', '')) WHERE ID = '$post_id'"); |