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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 |
|---|---|
| 265 | * @uses apply_filters() Calls 'template_directory_uri' filter on template directory URI path and template name. |
| 266 | * |
| 267 | * @return string Template directory URI. |
| 268 | */ |
| 269 | function get_template_directory_uri() { |
| 270 | $template = get_template(); |
| 271 | $theme_root_uri = get_theme_root_uri( $template ); |
| 272 | $template_dir_uri = "$theme_root_uri/$template"; |
| 273 | |
| 274 | return apply_filters( 'template_directory_uri', $template_dir_uri, $template, $theme_root_uri ); |
| 275 | } |
| 276 | |
| 277 | /** |
| 278 | * Retrieve theme roots. |
| 279 | * |
| 280 | * @since 2.9.0 |
| 281 | * |
| 282 | * @return array|string An array of theme roots keyed by template/stylesheet or a single theme root if all themes have the same root. |
| 283 | */ |