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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 |
|---|---|
| 3930 | if ( is_null( $row ) || !$row->meta_id ) |
| 3931 | return false; |
| 3932 | $cache_key = "{$wpdb->siteid}:$option"; |
| 3933 | wp_cache_delete( $cache_key, 'site-options' ); |
| 3934 | |
| 3935 | $result = $wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->sitemeta} WHERE meta_key = %s AND site_id = %d", $option, $wpdb->siteid ) ); |
| 3936 | } |
| 3937 | |
| 3938 | if ( $result ) { |
| 3939 | do_action( "delete_site_option_{$option}", $option ); |
| 3940 | do_action( "delete_site_option", $option ); |
| 3941 | return true; |
| 3942 | } |
| 3943 | return false; |
| 3944 | } |
| 3945 | |
| 3946 | /** |
| 3947 | * Update the value of a site option that was already added. |
| 3948 | * |