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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 |
|---|---|
| 2590 | /** |
| 2591 | * Filter the URL to the includes directory. |
| 2592 | * |
| 2593 | * @since 2.8.0 |
| 2594 | * |
| 2595 | * @param string $url The complete URL to the includes directory including scheme and path. |
| 2596 | * @param string $path Path relative to the URL to the wp-includes directory. Blank string |
| 2597 | * if no path is specified. |
| 2598 | */ |
| 2599 | return apply_filters( 'includes_url', $url, $path ); |
| 2600 | } |
| 2601 | |
| 2602 | /** |
| 2603 | * Retrieve the url to the content directory. |
| 2604 | * |
| 2605 | * @since 2.6.0 |
| 2606 | * |
| 2607 | * @param string $path Optional. Path relative to the content url. |
| 2608 | * @return string Content url link with optional path appended. |