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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 |
|---|---|
| 4883 | delete_transient( 'dirsize_cache' ); |
| 4884 | |
| 4885 | /** |
| 4886 | * Fires before an attachment is deleted, at the start of wp_delete_attachment(). |
| 4887 | * |
| 4888 | * @since 2.0.0 |
| 4889 | * |
| 4890 | * @param int $post_id Attachment ID. |
| 4891 | */ |
| 4892 | do_action( 'delete_attachment', $post_id ); |
| 4893 | |
| 4894 | wp_delete_object_term_relationships($post_id, array('category', 'post_tag')); |
| 4895 | wp_delete_object_term_relationships($post_id, get_object_taxonomies($post->post_type)); |
| 4896 | |
| 4897 | // Delete all for any posts. |
| 4898 | delete_metadata( 'post', null, '_thumbnail_id', $post_id, true ); |
| 4899 | |
| 4900 | wp_defer_comment_counting( true ); |
| 4901 | |