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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 |
|---|---|
| 1587 | * The dynamic portion of the hook name, `$option`, refers to the option name. |
| 1588 | * |
| 1589 | * @since 3.0.0 |
| 1590 | * @since 4.4.0 The `$option` parameter was added. |
| 1591 | * @since 4.7.0 The `$network_id` parameter was added. |
| 1592 | * |
| 1593 | * @param string $option Option name. |
| 1594 | * @param int $network_id ID of the network. |
| 1595 | */ |
| 1596 | do_action( "pre_delete_site_option_{$option}", $option, $network_id ); |
| 1597 | |
| 1598 | if ( ! is_multisite() ) { |
| 1599 | $result = delete_option( $option ); |
| 1600 | } else { |
| 1601 | $row = $wpdb->get_row( $wpdb->prepare( "SELECT meta_id FROM {$wpdb->sitemeta} WHERE meta_key = %s AND site_id = %d", $option, $network_id ) ); |
| 1602 | if ( is_null( $row ) || ! $row->meta_id ) { |
| 1603 | return false; |
| 1604 | } |
| 1605 | $cache_key = "$network_id:$option"; |