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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 | 
|---|---|
| 1748 |      $pinged  = get_pung($post_id); | 
| 1749 |      if ( empty($to_ping) ) { | 
| 1750 |           $wpdb->update($wpdb->posts, array('to_ping' => ''), array('ID' => $post_id) ); | 
| 1751 |           return; | 
| 1752 |      } | 
| 1753 |  | 
| 1754 |      if ( empty($post->post_excerpt) ) | 
| 1755 |           $excerpt = apply_filters('the_content', $post->post_content); | 
| 1756 |      else | 
| 1757 |           $excerpt = apply_filters('the_excerpt', $post->post_excerpt); | 
| 1758 |      $excerpt = str_replace(']]>', ']]>', $excerpt); | 
| 1759 |      $excerpt = wp_html_excerpt($excerpt, 252) . '...'; | 
| 1760 |  | 
| 1761 |      $post_title = apply_filters('the_title', $post->post_title, $post->ID); | 
| 1762 |      $post_title = strip_tags($post_title); | 
| 1763 |  | 
| 1764 |      if ( $to_ping ) { | 
| 1765 |           foreach ( (array) $to_ping as $tb_ping ) { | 
| 1766 |                $tb_ping = trim($tb_ping); |