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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 |
|---|---|
| 1366 | * @since 3.4.0 |
| 1367 | * @since 4.4.0 The `$option` parameter was added. |
| 1368 | * @since 4.7.0 The `$network_id` parameter was added. |
| 1369 | * |
| 1370 | * @param mixed $default The value to return if the site option does not exist |
| 1371 | * in the database. |
| 1372 | * @param string $option Option name. |
| 1373 | * @param int $network_id ID of the network. |
| 1374 | */ |
| 1375 | return apply_filters( "default_site_option_{$option}", $default, $option, $network_id ); |
| 1376 | } |
| 1377 | |
| 1378 | if ( ! is_multisite() ) { |
| 1379 | /** This filter is documented in wp-includes/option.php */ |
| 1380 | $default = apply_filters( 'default_site_option_' . $option, $default, $option, $network_id ); |
| 1381 | $value = get_option( $option, $default ); |
| 1382 | } else { |
| 1383 | $cache_key = "$network_id:$option"; |
| 1384 | $value = wp_cache_get( $cache_key, 'site-options' ); |
| 1385 | |
| 1386 | if ( ! isset( $value ) || false === $value ) { |
| 1387 | $row = $wpdb->get_row( $wpdb->prepare( "SELECT meta_value FROM $wpdb->sitemeta WHERE meta_key = %s AND site_id = %d", $option, $network_id ) ); |
| 1388 | |
| 1389 | // Has to be get_row() instead of get_var() because of funkiness with 0, false, null values. |
| Line | Code |
| 1394 | } else { |
| 1395 | if ( ! is_array( $notoptions ) ) { |
| 1396 | $notoptions = array(); |
| 1397 | } |
| 1398 | |
| 1399 | $notoptions[ $option ] = true; |
| 1400 | wp_cache_set( $notoptions_key, $notoptions, 'site-options' ); |
| 1401 | |
| 1402 | /** This filter is documented in wp-includes/option.php */ |
| 1403 | $value = apply_filters( 'default_site_option_' . $option, $default, $option, $network_id ); |
| 1404 | } |
| 1405 | } |
| 1406 | } |
| 1407 | |
| 1408 | if ( ! is_array( $notoptions ) ) { |
| 1409 | $notoptions = array(); |
| 1410 | wp_cache_set( $notoptions_key, $notoptions, 'site-options' ); |
| 1411 | } |
| 1412 | |