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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 |
|---|---|
| 1272 | if ( EMPTY_TRASH_DAYS == 0 ) |
| 1273 | return wp_delete_post($post_id); |
| 1274 | |
| 1275 | if ( !$post = wp_get_single_post($post_id, ARRAY_A) ) |
| 1276 | return $post; |
| 1277 | |
| 1278 | if ( $post['post_status'] == 'trash' ) |
| 1279 | return false; |
| 1280 | |
| 1281 | do_action('trash_post', $post_id); |
| 1282 | |
| 1283 | add_post_meta($post_id,'_wp_trash_meta_status', $post['post_status']); |
| 1284 | add_post_meta($post_id,'_wp_trash_meta_time', time()); |
| 1285 | |
| 1286 | $post['post_status'] = 'trash'; |
| 1287 | wp_insert_post($post); |
| 1288 | |
| 1289 | wp_trash_post_comments($post_id); |
| 1290 | |