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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 |
|---|---|
| 710 | $post = $wpdb->get_row("SELECT * FROM $wpdb->posts WHERE ID = $post_id"); |
| 711 | $to_ping = get_to_ping($post_id); |
| 712 | $pinged = get_pung($post_id); |
| 713 | if ( empty($to_ping) ) { |
| 714 | $wpdb->query("UPDATE $wpdb->posts SET to_ping = '' WHERE ID = '$post_id'"); |
| 715 | return; |
| 716 | } |
| 717 | |
| 718 | if (empty($post->post_excerpt)) |
| 719 | $excerpt = apply_filters('the_content', $post->post_content); |
| 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 | |