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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 |
|---|---|
| 856 | if ( is_null( $row ) || !$row->meta_id ) |
| 857 | return false; |
| 858 | $cache_key = "{$wpdb->siteid}:$option"; |
| 859 | wp_cache_delete( $cache_key, 'site-options' ); |
| 860 | |
| 861 | $result = $wpdb->delete( $wpdb->sitemeta, array( 'meta_key' => $option, 'site_id' => $wpdb->siteid ) ); |
| 862 | } |
| 863 | |
| 864 | if ( $result ) { |
| 865 | do_action( "delete_site_option_{$option}", $option ); |
| 866 | do_action( "delete_site_option", $option ); |
| 867 | return true; |
| 868 | } |
| 869 | return false; |
| 870 | } |
| 871 | |
| 872 | /** |
| 873 | * Update the value of a site option that was already added. |
| 874 | * |