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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 |
|---|---|
| 3687 | * @uses do_action() Calls 'add_site_option_$option' and 'add_site_option' hooks on success. |
| 3688 | * |
| 3689 | * @param string $option Name of option to add. Expected to not be SQL-escaped. |
| 3690 | * @param mixed $value Optional. Option value, can be anything. Expected to not be SQL-escaped. |
| 3691 | * @return bool False if option was not added and true if option was added. |
| 3692 | */ |
| 3693 | function add_site_option( $option, $value ) { |
| 3694 | global $wpdb; |
| 3695 | |
| 3696 | $value = apply_filters( 'pre_add_site_option_' . $option, $value ); |
| 3697 | |
| 3698 | if ( !is_multisite() ) { |
| 3699 | $result = add_option( $option, $value ); |
| 3700 | } else { |
| 3701 | $cache_key = "{$wpdb->siteid}:$option"; |
| 3702 | |
| 3703 | if ( $wpdb->get_row( $wpdb->prepare( "SELECT meta_value FROM $wpdb->sitemeta WHERE meta_key = %s AND site_id = %d", $option, $wpdb->siteid ) ) ) |
| 3704 | return update_site_option( $option, $value ); |
| 3705 | |