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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 |
|---|---|
| 34 | if ( get_option('db_upgraded') ) { |
| 35 | flush_rewrite_rules(); |
| 36 | update_option( 'db_upgraded', false ); |
| 37 | |
| 38 | /** |
| 39 | * Runs on the next page load after successful upgrade |
| 40 | * |
| 41 | * @since 2.8 |
| 42 | */ |
| 43 | do_action('after_db_upgrade'); |
| 44 | } elseif ( get_option('db_version') != $wp_db_version && empty($_POST) ) { |
| 45 | if ( !is_multisite() ) { |
| 46 | wp_redirect( admin_url( 'upgrade.php?_wp_http_referer=' . urlencode( wp_unslash( $_SERVER['REQUEST_URI'] ) ) ) ); |
| 47 | exit; |
| 48 | } elseif ( apply_filters( 'do_mu_upgrade', true ) ) { |
| 49 | /** |
| 50 | * On really small MU installs run the upgrader every time, |
| 51 | * else run it less often to reduce load. |
| 52 | * |