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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 |
|---|---|
| 6351 | /** |
| 6352 | * Fires before an attachment is deleted, at the start of wp_delete_attachment(). |
| 6353 | * |
| 6354 | * @since 2.0.0 |
| 6355 | * @since 5.5.0 Added the `$post` parameter. |
| 6356 | * |
| 6357 | * @param int $post_id Attachment ID. |
| 6358 | * @param WP_Post $post Post object. |
| 6359 | */ |
| 6360 | do_action( 'delete_attachment', $post_id, $post ); |
| 6361 | |
| 6362 | wp_delete_object_term_relationships( $post_id, array( 'category', 'post_tag' ) ); |
| 6363 | wp_delete_object_term_relationships( $post_id, get_object_taxonomies( $post->post_type ) ); |
| 6364 | |
| 6365 | // Delete all for any posts. |
| 6366 | delete_metadata( 'post', null, '_thumbnail_id', $post_id, true ); |
| 6367 | |
| 6368 | wp_defer_comment_counting( true ); |
| 6369 | |