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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 |
|---|---|
| 869 | * See {@see 'after_switch_theme'}. |
| 870 | * |
| 871 | * @since 1.5.0 |
| 872 | * @since 4.5.0 Introduced the `$old_theme` parameter. |
| 873 | * |
| 874 | * @param string $new_name Name of the new theme. |
| 875 | * @param WP_Theme $new_theme WP_Theme instance of the new theme. |
| 876 | * @param WP_Theme $old_theme WP_Theme instance of the old theme. |
| 877 | */ |
| 878 | do_action( 'switch_theme', $new_name, $new_theme, $old_theme ); |
| 879 | } |
| 880 | |
| 881 | /** |
| 882 | * Checks that the active theme has the required files. |
| 883 | * |
| 884 | * Standalone themes need to have a `templates/index.html` or `index.php` template file. |
| 885 | * Child themes need to have a `Template` header in the `style.css` stylesheet. |
| 886 | * |
| 887 | * Does not initially check the default theme, which is the fallback and should always exist. |