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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 |
|---|---|
| 3826 | if ( is_null( $row ) || !$row->meta_id ) |
| 3827 | return false; |
| 3828 | $cache_key = "{$wpdb->siteid}:$option"; |
| 3829 | wp_cache_delete( $cache_key, 'site-options' ); |
| 3830 | |
| 3831 | $result = $wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->sitemeta} WHERE meta_key = %s AND site_id = %d", $option, $wpdb->siteid ) ); |
| 3832 | } |
| 3833 | |
| 3834 | if ( $result ) { |
| 3835 | do_action( "delete_site_option_{$option}", $option ); |
| 3836 | do_action( "delete_site_option", $option ); |
| 3837 | return true; |
| 3838 | } |
| 3839 | return false; |
| 3840 | } |
| 3841 | |
| 3842 | /** |
| 3843 | * Update the value of a site option that was already added. |
| 3844 | * |