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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 |
|---|---|
| 38 | if ( get_option( 'db_upgraded' ) ) { |
| 39 | flush_rewrite_rules(); |
| 40 | update_option( 'db_upgraded', false ); |
| 41 | |
| 42 | /** |
| 43 | * Fires on the next page load after a successful DB upgrade. |
| 44 | * |
| 45 | * @since 2.8.0 |
| 46 | */ |
| 47 | do_action( 'after_db_upgrade' ); |
| 48 | } elseif ( get_option( 'db_version' ) != $wp_db_version && empty( $_POST ) ) { |
| 49 | if ( ! is_multisite() ) { |
| 50 | wp_redirect( admin_url( 'upgrade.php?_wp_http_referer=' . urlencode( wp_unslash( $_SERVER['REQUEST_URI'] ) ) ) ); |
| 51 | exit; |
| 52 | |
| 53 | /** |
| 54 | * Filters whether to attempt to perform the multisite DB upgrade routine. |
| 55 | * |
| 56 | * In single site, the user would be redirected to wp-admin/upgrade.php. |