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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.
This hook occurs 3 times in this file.
| Line | Code |
|---|---|
| 1412 | * @since 3.4.0 |
| 1413 | * @since 4.4.0 The `$option` parameter was added. |
| 1414 | * @since 4.7.0 The `$network_id` parameter was added. |
| 1415 | * |
| 1416 | * @param mixed $default The value to return if the site option does not exist |
| 1417 | * in the database. |
| 1418 | * @param string $option Option name. |
| 1419 | * @param int $network_id ID of the network. |
| 1420 | */ |
| 1421 | return apply_filters( "default_site_option_{$option}", $default, $option, $network_id ); |
| 1422 | } |
| 1423 | |
| 1424 | if ( ! is_multisite() ) { |
| 1425 | /** This filter is documented in wp-includes/option.php */ |
| 1426 | $default = apply_filters( 'default_site_option_' . $option, $default, $option, $network_id ); |
| 1427 | $value = get_option( $option, $default ); |
| 1428 | } else { |
| 1429 | $cache_key = "$network_id:$option"; |
| 1430 | $value = wp_cache_get( $cache_key, 'site-options' ); |
| 1431 | |
| 1432 | if ( ! isset( $value ) || false === $value ) { |
| 1433 | $row = $wpdb->get_row( $wpdb->prepare( "SELECT meta_value FROM $wpdb->sitemeta WHERE meta_key = %s AND site_id = %d", $option, $network_id ) ); |
| 1434 | |
| 1435 | // Has to be get_row() instead of get_var() because of funkiness with 0, false, null values. |
| Line | Code |
| 1440 | } else { |
| 1441 | if ( ! is_array( $notoptions ) ) { |
| 1442 | $notoptions = array(); |
| 1443 | } |
| 1444 | |
| 1445 | $notoptions[ $option ] = true; |
| 1446 | wp_cache_set( $notoptions_key, $notoptions, 'site-options' ); |
| 1447 | |
| 1448 | /** This filter is documented in wp-includes/option.php */ |
| 1449 | $value = apply_filters( 'default_site_option_' . $option, $default, $option, $network_id ); |
| 1450 | } |
| 1451 | } |
| 1452 | } |
| 1453 | |
| 1454 | if ( ! is_array( $notoptions ) ) { |
| 1455 | $notoptions = array(); |
| 1456 | wp_cache_set( $notoptions_key, $notoptions, 'site-options' ); |
| 1457 | } |
| 1458 | |