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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 |
|---|---|
| 1038 | $post = $wpdb->get_row("SELECT * FROM $wpdb->posts WHERE ID = $post_id"); |
| 1039 | $to_ping = get_to_ping($post_id); |
| 1040 | $pinged = get_pung($post_id); |
| 1041 | if ( empty($to_ping) ) { |
| 1042 | $wpdb->query("UPDATE $wpdb->posts SET to_ping = '' WHERE ID = '$post_id'"); |
| 1043 | return; |
| 1044 | } |
| 1045 | |
| 1046 | if ( empty($post->post_excerpt) ) |
| 1047 | $excerpt = apply_filters('the_content', $post->post_content); |
| 1048 | else |
| 1049 | $excerpt = apply_filters('the_excerpt', $post->post_excerpt); |
| 1050 | $excerpt = str_replace(']]>', ']]>', $excerpt); |
| 1051 | $excerpt = wp_html_excerpt($excerpt, 252) . '...'; |
| 1052 | |
| 1053 | $post_title = apply_filters('the_title', $post->post_title); |
| 1054 | $post_title = strip_tags($post_title); |
| 1055 | |
| 1056 | if ( $to_ping ) { |