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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 |
|---|---|
| 2778 | /** |
| 2779 | * Filter the URL to the includes directory. |
| 2780 | * |
| 2781 | * @since 2.8.0 |
| 2782 | * |
| 2783 | * @param string $url The complete URL to the includes directory including scheme and path. |
| 2784 | * @param string $path Path relative to the URL to the wp-includes directory. Blank string |
| 2785 | * if no path is specified. |
| 2786 | */ |
| 2787 | return apply_filters( 'includes_url', $url, $path ); |
| 2788 | } |
| 2789 | |
| 2790 | /** |
| 2791 | * Retrieve the url to the content directory. |
| 2792 | * |
| 2793 | * @since 2.6.0 |
| 2794 | * |
| 2795 | * @param string $path Optional. Path relative to the content url. |
| 2796 | * @return string Content url link with optional path appended. |