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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 |
|---|---|
| 578 | |
| 579 | /** |
| 580 | * Filters the relative path to an uploaded file. |
| 581 | * |
| 582 | * @since 2.9.0 |
| 583 | * |
| 584 | * @param string $new_path Relative path to the file. |
| 585 | * @param string $path Full path to the file. |
| 586 | */ |
| 587 | return apply_filters( '_wp_relative_upload_path', $new_path, $path ); |
| 588 | } |
| 589 | |
| 590 | /** |
| 591 | * Retrieve all children of the post parent ID. |
| 592 | * |
| 593 | * Normally, without any enhancements, the children would apply to pages. In the |
| 594 | * context of the inner workings of WordPress, pages, posts, and attachments |
| 595 | * share the same table, so therefore the functionality could apply to any one |
| 596 | * of them. It is then noted that while this function does not work on posts, it |