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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 |
|---|---|
| 6395 | /** |
| 6396 | * Fires before an attachment is deleted, at the start of wp_delete_attachment(). |
| 6397 | * |
| 6398 | * @since 2.0.0 |
| 6399 | * @since 5.5.0 Added the `$post` parameter. |
| 6400 | * |
| 6401 | * @param int $post_id Attachment ID. |
| 6402 | * @param WP_Post $post Post object. |
| 6403 | */ |
| 6404 | do_action( 'delete_attachment', $post_id, $post ); |
| 6405 | |
| 6406 | wp_delete_object_term_relationships( $post_id, array( 'category', 'post_tag' ) ); |
| 6407 | wp_delete_object_term_relationships( $post_id, get_object_taxonomies( $post->post_type ) ); |
| 6408 | |
| 6409 | // Delete all for any posts. |
| 6410 | delete_metadata( 'post', null, '_thumbnail_id', $post_id, true ); |
| 6411 | |
| 6412 | wp_defer_comment_counting( true ); |
| 6413 | |