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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 | 
|---|---|
| 57 |  * @since 1.5.0 | 
| 58 |  * | 
| 59 |  * @return string | 
| 60 |  */ | 
| 61 | function get_stylesheet_directory_uri() { | 
| 62 |      $stylesheet = get_stylesheet(); | 
| 63 |      $theme_root_uri = get_theme_root_uri( $stylesheet ); | 
| 64 |      $stylesheet_dir_uri = "$theme_root_uri/$stylesheet"; | 
| 65 |  | 
| 66 |      return apply_filters( 'stylesheet_directory_uri', $stylesheet_dir_uri, $stylesheet, $theme_root_uri ); | 
| 67 | } | 
| 68 |  | 
| 69 | /** | 
| 70 |  * Retrieve URI of current theme stylesheet. | 
| 71 |  * | 
| 72 |  * The stylesheet file name is 'style.css' which is appended to {@link | 
| 73 |  * get_stylesheet_directory_uri() stylesheet directory URI} path. | 
| 74 |  * | 
| 75 |  * @since 1.5.0 |