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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 |
|---|---|
| 1567 | $post = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->posts WHERE ID = %d", $post_id) ); |
| 1568 | $to_ping = get_to_ping($post_id); |
| 1569 | $pinged = get_pung($post_id); |
| 1570 | if ( empty($to_ping) ) { |
| 1571 | $wpdb->update($wpdb->posts, array('to_ping' => ''), array('ID' => $post_id) ); |
| 1572 | return; |
| 1573 | } |
| 1574 | |
| 1575 | if ( empty($post->post_excerpt) ) |
| 1576 | $excerpt = apply_filters('the_content', $post->post_content); |
| 1577 | else |
| 1578 | $excerpt = apply_filters('the_excerpt', $post->post_excerpt); |
| 1579 | $excerpt = str_replace(']]>', ']]>', $excerpt); |
| 1580 | $excerpt = wp_html_excerpt($excerpt, 252) . '...'; |
| 1581 | |
| 1582 | $post_title = apply_filters('the_title', $post->post_title); |
| 1583 | $post_title = strip_tags($post_title); |
| 1584 | |
| 1585 | if ( $to_ping ) { |