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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 |
|---|---|
| 3766 | * @uses do_action() Calls 'add_site_option_$option' and 'add_site_option' hooks on success. |
| 3767 | * |
| 3768 | * @param string $option Name of option to add. Expected to not be SQL-escaped. |
| 3769 | * @param mixed $value Optional. Option value, can be anything. Expected to not be SQL-escaped. |
| 3770 | * @return bool False if option was not added and true if option was added. |
| 3771 | */ |
| 3772 | function add_site_option( $option, $value ) { |
| 3773 | global $wpdb; |
| 3774 | |
| 3775 | $value = apply_filters( 'pre_add_site_option_' . $option, $value ); |
| 3776 | |
| 3777 | if ( !is_multisite() ) { |
| 3778 | $result = add_option( $option, $value ); |
| 3779 | } else { |
| 3780 | $cache_key = "{$wpdb->siteid}:$option"; |
| 3781 | |
| 3782 | if ( $wpdb->get_row( $wpdb->prepare( "SELECT meta_value FROM $wpdb->sitemeta WHERE meta_key = %s AND site_id = %d", $option, $wpdb->siteid ) ) ) |
| 3783 | return update_site_option( $option, $value ); |
| 3784 | |