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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 |
|---|---|
| 1257 | * @since 3.4.0 |
| 1258 | * @since 4.4.0 The `$option` parameter was added. |
| 1259 | * @since 4.7.0 The `$network_id` parameter was added. |
| 1260 | * |
| 1261 | * @param mixed $default The value to return if the site option does not exist |
| 1262 | * in the database. |
| 1263 | * @param string $option Option name. |
| 1264 | * @param int $network_id ID of the network. |
| 1265 | */ |
| 1266 | return apply_filters( "default_site_option_{$option}", $default, $option, $network_id ); |
| 1267 | } |
| 1268 | |
| 1269 | if ( ! is_multisite() ) { |
| 1270 | /** This filter is documented in wp-includes/option.php */ |
| 1271 | $default = apply_filters( 'default_site_option_' . $option, $default, $option, $network_id ); |
| 1272 | $value = get_option( $option, $default ); |
| 1273 | } else { |
| 1274 | $cache_key = "$network_id:$option"; |
| 1275 | $value = wp_cache_get( $cache_key, 'site-options' ); |
| 1276 | |
| 1277 | if ( ! isset( $value ) || false === $value ) { |
| 1278 | $row = $wpdb->get_row( $wpdb->prepare( "SELECT meta_value FROM $wpdb->sitemeta WHERE meta_key = %s AND site_id = %d", $option, $network_id ) ); |
| 1279 | |
| 1280 | // Has to be get_row instead of get_var because of funkiness with 0, false, null values |
| Line | Code |
| 1284 | wp_cache_set( $cache_key, $value, 'site-options' ); |
| 1285 | } else { |
| 1286 | if ( ! is_array( $notoptions ) ) { |
| 1287 | $notoptions = array(); |
| 1288 | } |
| 1289 | $notoptions[ $option ] = true; |
| 1290 | wp_cache_set( $notoptions_key, $notoptions, 'site-options' ); |
| 1291 | |
| 1292 | /** This filter is documented in wp-includes/option.php */ |
| 1293 | $value = apply_filters( 'default_site_option_' . $option, $default, $option, $network_id ); |
| 1294 | } |
| 1295 | } |
| 1296 | } |
| 1297 | |
| 1298 | if ( ! is_array( $notoptions ) ) { |
| 1299 | $notoptions = array(); |
| 1300 | wp_cache_set( $notoptions_key, $notoptions, 'site-options' ); |
| 1301 | } |
| 1302 | |