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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 |
|---|---|
| 789 | * Fires after the theme is switched. |
| 790 | * |
| 791 | * @since 1.5.0 |
| 792 | * @since 4.5.0 Introduced the `$old_theme` parameter. |
| 793 | * |
| 794 | * @param string $new_name Name of the new theme. |
| 795 | * @param WP_Theme $new_theme WP_Theme instance of the new theme. |
| 796 | * @param WP_Theme $old_theme WP_Theme instance of the old theme. |
| 797 | */ |
| 798 | do_action( 'switch_theme', $new_name, $new_theme, $old_theme ); |
| 799 | } |
| 800 | |
| 801 | /** |
| 802 | * Checks that current theme files 'index.php' and 'style.css' exists. |
| 803 | * |
| 804 | * Does not initially check the default theme, which is the fallback and should always exist. |
| 805 | * But if it doesn't exist, it'll fall back to the latest core default theme that does exist. |
| 806 | * Will switch theme to the fallback theme if current theme does not validate. |
| 807 | * |