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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 |
|---|---|
| 6020 | /** |
| 6021 | * Filters whether an attachment deletion should take place. |
| 6022 | * |
| 6023 | * @since 5.5.0 |
| 6024 | * |
| 6025 | * @param bool|null $delete Whether to go forward with deletion. |
| 6026 | * @param WP_Post $post Post object. |
| 6027 | * @param bool $force_delete Whether to bypass the Trash. |
| 6028 | */ |
| 6029 | $check = apply_filters( 'pre_delete_attachment', null, $post, $force_delete ); |
| 6030 | if ( null !== $check ) { |
| 6031 | return $check; |
| 6032 | } |
| 6033 | |
| 6034 | delete_post_meta( $post_id, '_wp_trash_meta_status' ); |
| 6035 | delete_post_meta( $post_id, '_wp_trash_meta_time' ); |
| 6036 | |
| 6037 | $meta = wp_get_attachment_metadata( $post_id ); |
| 6038 | $backup_sizes = get_post_meta( $post->ID, '_wp_attachment_backup_sizes', true ); |