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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 |
|---|---|
| 640 | $post = $wpdb->get_row("SELECT * FROM $wpdb->posts WHERE ID = $post_id"); |
| 641 | $to_ping = get_to_ping($post_id); |
| 642 | $pinged = get_pung($post_id); |
| 643 | if ( empty($to_ping) ) { |
| 644 | $wpdb->query("UPDATE $wpdb->posts SET to_ping = '' WHERE ID = '$post_id'"); |
| 645 | return; |
| 646 | } |
| 647 | |
| 648 | if ( empty($post->post_excerpt) ) |
| 649 | $excerpt = apply_filters('the_content', $post->post_content); |
| 650 | else |
| 651 | $excerpt = apply_filters('the_excerpt', $post->post_excerpt); |
| 652 | $excerpt = str_replace(']]>', ']]>', $excerpt); |
| 653 | $excerpt = strip_tags($excerpt); |
| 654 | if ( function_exists('mb_strcut') ) // For international trackbacks |
| 655 | $excerpt = mb_strcut($excerpt, 0, 252, get_option('blog_charset')) . '...'; |
| 656 | else |
| 657 | $excerpt = substr($excerpt, 0, 252) . '...'; |
| 658 | |