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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 |
|---|---|
| 820 | * Fires after the theme is switched. |
| 821 | * |
| 822 | * @since 1.5.0 |
| 823 | * @since 4.5.0 Introduced the `$old_theme` parameter. |
| 824 | * |
| 825 | * @param string $new_name Name of the new theme. |
| 826 | * @param WP_Theme $new_theme WP_Theme instance of the new theme. |
| 827 | * @param WP_Theme $old_theme WP_Theme instance of the old theme. |
| 828 | */ |
| 829 | do_action( 'switch_theme', $new_name, $new_theme, $old_theme ); |
| 830 | } |
| 831 | |
| 832 | /** |
| 833 | * Checks that the active theme has the required files. |
| 834 | * |
| 835 | * Standalone themes need to have a `templates/index.html` or `index.php` template file. |
| 836 | * Child themes need to have a `Template` header in the `style.css` stylesheet. |
| 837 | * |
| 838 | * Does not initially check the default theme, which is the fallback and should always exist. |