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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 |
|---|---|
| 255 | |
| 256 | /** |
| 257 | * Filter the relative path to an uploaded file. |
| 258 | * |
| 259 | * @since 2.9.0 |
| 260 | * |
| 261 | * @param string $new_path Relative path to the file. |
| 262 | * @param string $path Full path to the file. |
| 263 | */ |
| 264 | return apply_filters( '_wp_relative_upload_path', $new_path, $path ); |
| 265 | } |
| 266 | |
| 267 | /** |
| 268 | * Retrieve all children of the post parent ID. |
| 269 | * |
| 270 | * Normally, without any enhancements, the children would apply to pages. In the |
| 271 | * context of the inner workings of WordPress, pages, posts, and attachments |
| 272 | * share the same table, so therefore the functionality could apply to any one |
| 273 | * of them. It is then noted that while this function does not work on posts, it |