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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 |
|---|---|
| 5806 | /** |
| 5807 | * Fires before an attachment is deleted, at the start of wp_delete_attachment(). |
| 5808 | * |
| 5809 | * @since 2.0.0 |
| 5810 | * @since 5.5.0 Added the `$post` parameter. |
| 5811 | * |
| 5812 | * @param int $post_id Attachment ID. |
| 5813 | * @param WP_Post $post Post object. |
| 5814 | */ |
| 5815 | do_action( 'delete_attachment', $post_id, $post ); |
| 5816 | |
| 5817 | wp_delete_object_term_relationships( $post_id, array( 'category', 'post_tag' ) ); |
| 5818 | wp_delete_object_term_relationships( $post_id, get_object_taxonomies( $post->post_type ) ); |
| 5819 | |
| 5820 | // Delete all for any posts. |
| 5821 | delete_metadata( 'post', null, '_thumbnail_id', $post_id, true ); |
| 5822 | |
| 5823 | wp_defer_comment_counting( true ); |
| 5824 | |