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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 |
|---|---|
| 2838 | /** |
| 2839 | * Filter the URL to the includes directory. |
| 2840 | * |
| 2841 | * @since 2.8.0 |
| 2842 | * |
| 2843 | * @param string $url The complete URL to the includes directory including scheme and path. |
| 2844 | * @param string $path Path relative to the URL to the wp-includes directory. Blank string |
| 2845 | * if no path is specified. |
| 2846 | */ |
| 2847 | return apply_filters( 'includes_url', $url, $path ); |
| 2848 | } |
| 2849 | |
| 2850 | /** |
| 2851 | * Retrieve the url to the content directory. |
| 2852 | * |
| 2853 | * @since 2.6.0 |
| 2854 | * |
| 2855 | * @param string $path Optional. Path relative to the content url. |
| 2856 | * @return string Content url link with optional path appended. |