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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 | 
|---|---|
| 2670 |      $to_ping = get_to_ping( $post ); | 
| 2671 |      $pinged  = get_pung( $post ); | 
| 2672 |      if ( empty( $to_ping ) ) { | 
| 2673 |           $wpdb->update( $wpdb->posts, array( 'to_ping' => '' ), array( 'ID' => $post->ID ) ); | 
| 2674 |           return; | 
| 2675 |      } | 
| 2676 |  | 
| 2677 |      if ( empty( $post->post_excerpt ) ) { | 
| 2678 |           /** This filter is documented in wp-includes/post-template.php */ | 
| 2679 |           $excerpt = apply_filters( 'the_content', $post->post_content, $post->ID ); | 
| 2680 |      } else { | 
| 2681 |           /** This filter is documented in wp-includes/post-template.php */ | 
| 2682 |           $excerpt = apply_filters( 'the_excerpt', $post->post_excerpt ); | 
| 2683 |      } | 
| 2684 |  | 
| 2685 |      $excerpt = str_replace( ']]>', ']]>', $excerpt ); | 
| 2686 |      $excerpt = wp_html_excerpt( $excerpt, 252, '…' ); | 
| 2687 |  | 
| 2688 |      /** This filter is documented in wp-includes/post-template.php */ |