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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 |
|---|---|
| 1274 | * @since 3.4.0 |
| 1275 | * @since 4.4.0 The `$option` parameter was added. |
| 1276 | * @since 4.7.0 The `$network_id` parameter was added. |
| 1277 | * |
| 1278 | * @param mixed $default The value to return if the site option does not exist |
| 1279 | * in the database. |
| 1280 | * @param string $option Option name. |
| 1281 | * @param int $network_id ID of the network. |
| 1282 | */ |
| 1283 | return apply_filters( "default_site_option_{$option}", $default, $option, $network_id ); |
| 1284 | } |
| 1285 | |
| 1286 | if ( ! is_multisite() ) { |
| 1287 | /** This filter is documented in wp-includes/option.php */ |
| 1288 | $default = apply_filters( 'default_site_option_' . $option, $default, $option, $network_id ); |
| 1289 | $value = get_option( $option, $default ); |
| 1290 | } else { |
| 1291 | $cache_key = "$network_id:$option"; |
| 1292 | $value = wp_cache_get( $cache_key, 'site-options' ); |
| 1293 | |
| 1294 | if ( ! isset( $value ) || false === $value ) { |
| 1295 | $row = $wpdb->get_row( $wpdb->prepare( "SELECT meta_value FROM $wpdb->sitemeta WHERE meta_key = %s AND site_id = %d", $option, $network_id ) ); |
| 1296 | |
| 1297 | // Has to be get_row() instead of get_var() because of funkiness with 0, false, null values. |
| Line | Code |
| 1301 | wp_cache_set( $cache_key, $value, 'site-options' ); |
| 1302 | } else { |
| 1303 | if ( ! is_array( $notoptions ) ) { |
| 1304 | $notoptions = array(); |
| 1305 | } |
| 1306 | $notoptions[ $option ] = true; |
| 1307 | wp_cache_set( $notoptions_key, $notoptions, 'site-options' ); |
| 1308 | |
| 1309 | /** This filter is documented in wp-includes/option.php */ |
| 1310 | $value = apply_filters( 'default_site_option_' . $option, $default, $option, $network_id ); |
| 1311 | } |
| 1312 | } |
| 1313 | } |
| 1314 | |
| 1315 | if ( ! is_array( $notoptions ) ) { |
| 1316 | $notoptions = array(); |
| 1317 | wp_cache_set( $notoptions_key, $notoptions, 'site-options' ); |
| 1318 | } |
| 1319 | |