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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 |
|---|---|
| 2007 | * @since 3.4.0 |
| 2008 | * @since 4.4.0 The `$option` parameter was added. |
| 2009 | * @since 4.7.0 The `$network_id` parameter was added. |
| 2010 | * |
| 2011 | * @param mixed $default_value The value to return if the site option does not exist |
| 2012 | * in the database. |
| 2013 | * @param string $option Option name. |
| 2014 | * @param int $network_id ID of the network. |
| 2015 | */ |
| 2016 | return apply_filters( "default_site_option_{$option}", $default_value, $option, $network_id ); |
| 2017 | } |
| 2018 | |
| 2019 | if ( ! is_multisite() ) { |
| 2020 | /** This filter is documented in wp-includes/option.php */ |
| 2021 | $default_value = apply_filters( 'default_site_option_' . $option, $default_value, $option, $network_id ); |
| 2022 | $value = get_option( $option, $default_value ); |
| 2023 | } else { |
| 2024 | $cache_key = "$network_id:$option"; |
| 2025 | $value = wp_cache_get( $cache_key, 'site-options' ); |
| 2026 | |
| 2027 | if ( ! isset( $value ) || false === $value ) { |
| 2028 | $row = $wpdb->get_row( $wpdb->prepare( "SELECT meta_value FROM $wpdb->sitemeta WHERE meta_key = %s AND site_id = %d", $option, $network_id ) ); |
| 2029 | |
| 2030 | // Has to be get_row() instead of get_var() because of funkiness with 0, false, null values. |
| Line | Code |
| 2035 | } else { |
| 2036 | if ( ! is_array( $notoptions ) ) { |
| 2037 | $notoptions = array(); |
| 2038 | } |
| 2039 | |
| 2040 | $notoptions[ $option ] = true; |
| 2041 | wp_cache_set( $notoptions_key, $notoptions, 'site-options' ); |
| 2042 | |
| 2043 | /** This filter is documented in wp-includes/option.php */ |
| 2044 | $value = apply_filters( 'default_site_option_' . $option, $default_value, $option, $network_id ); |
| 2045 | } |
| 2046 | } |
| 2047 | } |
| 2048 | |
| 2049 | if ( ! is_array( $notoptions ) ) { |
| 2050 | $notoptions = array(); |
| 2051 | wp_cache_set( $notoptions_key, $notoptions, 'site-options' ); |
| 2052 | } |
| 2053 | |