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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 |
|---|---|
| 619 | $post = $wpdb->get_row("SELECT * FROM $wpdb->posts WHERE ID = $post_id"); |
| 620 | $to_ping = get_to_ping($post_id); |
| 621 | $pinged = get_pung($post_id); |
| 622 | if ( empty($to_ping) ) { |
| 623 | $wpdb->query("UPDATE $wpdb->posts SET to_ping = '' WHERE ID = '$post_id'"); |
| 624 | return; |
| 625 | } |
| 626 | |
| 627 | if ( empty($post->post_excerpt) ) |
| 628 | $excerpt = apply_filters('the_content', $post->post_content); |
| 629 | else |
| 630 | $excerpt = apply_filters('the_excerpt', $post->post_excerpt); |
| 631 | $excerpt = str_replace(']]>', ']]>', $excerpt); |
| 632 | $excerpt = strip_tags($excerpt); |
| 633 | if ( function_exists('mb_strcut') ) // For international trackbacks |
| 634 | $excerpt = mb_strcut($excerpt, 0, 252, get_option('blog_charset')) . '...'; |
| 635 | else |
| 636 | $excerpt = substr($excerpt, 0, 252) . '...'; |
| 637 | |