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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 |
|---|---|
| 899 | * Returning a non-null value will effectively short-circuit the function, returning |
| 900 | * that value instead. |
| 901 | * |
| 902 | * @since 5.1.0 |
| 903 | * |
| 904 | * @param bool|null $pre The value to return instead. Default null |
| 905 | * to continue with the check. |
| 906 | * @param int $site_id The site ID that is being checked. |
| 907 | */ |
| 908 | $pre = apply_filters( 'pre_wp_is_site_initialized', null, $site_id ); |
| 909 | if ( null !== $pre ) { |
| 910 | return (bool) $pre; |
| 911 | } |
| 912 | |
| 913 | $switch = false; |
| 914 | if ( get_current_blog_id() !== $site_id ) { |
| 915 | $switch = true; |
| 916 | remove_action( 'switch_blog', 'wp_switch_roles_and_user', 1 ); |
| 917 | switch_to_blog( $site_id ); |