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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 |
|---|---|
| 2484 | $to_ping = get_to_ping($post_id); |
| 2485 | $pinged = get_pung($post_id); |
| 2486 | if ( empty($to_ping) ) { |
| 2487 | $wpdb->update($wpdb->posts, array('to_ping' => ''), array('ID' => $post_id) ); |
| 2488 | return; |
| 2489 | } |
| 2490 | |
| 2491 | if ( empty($post->post_excerpt) ) { |
| 2492 | /** This filter is documented in wp-includes/post-template.php */ |
| 2493 | $excerpt = apply_filters( 'the_content', $post->post_content, $post->ID ); |
| 2494 | } else { |
| 2495 | /** This filter is documented in wp-includes/post-template.php */ |
| 2496 | $excerpt = apply_filters( 'the_excerpt', $post->post_excerpt ); |
| 2497 | } |
| 2498 | |
| 2499 | $excerpt = str_replace(']]>', ']]>', $excerpt); |
| 2500 | $excerpt = wp_html_excerpt($excerpt, 252, '…'); |
| 2501 | |
| 2502 | /** This filter is documented in wp-includes/post-template.php */ |