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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 |
|---|---|
| 3560 | * @uses do_action() Calls 'add_site_option_$option' and 'add_site_option' hooks on success. |
| 3561 | * |
| 3562 | * @param string $option Name of option to add. Expected to not be SQL-escaped. |
| 3563 | * @param mixed $value Optional. Option value, can be anything. Expected to not be SQL-escaped. |
| 3564 | * @return bool False if option was not added and true if option was added. |
| 3565 | */ |
| 3566 | function add_site_option( $option, $value ) { |
| 3567 | global $wpdb; |
| 3568 | |
| 3569 | $value = apply_filters( 'pre_add_site_option_' . $option, $value ); |
| 3570 | |
| 3571 | if ( !is_multisite() ) { |
| 3572 | $result = add_option( $option, $value ); |
| 3573 | } else { |
| 3574 | $cache_key = "{$wpdb->siteid}:$option"; |
| 3575 | |
| 3576 | if ( $wpdb->get_row( $wpdb->prepare( "SELECT meta_value FROM $wpdb->sitemeta WHERE meta_key = %s AND site_id = %d", $option, $wpdb->siteid ) ) ) |
| 3577 | return update_site_option( $option, $value ); |
| 3578 | |