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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 |
|---|---|
| 2074 | * @since 3.4.0 |
| 2075 | * @since 4.4.0 The `$option` parameter was added. |
| 2076 | * @since 4.7.0 The `$network_id` parameter was added. |
| 2077 | * |
| 2078 | * @param mixed $default_value The value to return if the site option does not exist |
| 2079 | * in the database. |
| 2080 | * @param string $option Option name. |
| 2081 | * @param int $network_id ID of the network. |
| 2082 | */ |
| 2083 | return apply_filters( "default_site_option_{$option}", $default_value, $option, $network_id ); |
| 2084 | } |
| 2085 | |
| 2086 | if ( ! is_multisite() ) { |
| 2087 | /** This filter is documented in wp-includes/option.php */ |
| 2088 | $default_value = apply_filters( 'default_site_option_' . $option, $default_value, $option, $network_id ); |
| 2089 | $value = get_option( $option, $default_value ); |
| 2090 | } else { |
| 2091 | $cache_key = "$network_id:$option"; |
| 2092 | $value = wp_cache_get( $cache_key, 'site-options' ); |
| 2093 | |
| 2094 | if ( ! isset( $value ) || false === $value ) { |
| 2095 | $row = $wpdb->get_row( $wpdb->prepare( "SELECT meta_value FROM $wpdb->sitemeta WHERE meta_key = %s AND site_id = %d", $option, $network_id ) ); |
| 2096 | |
| 2097 | // Has to be get_row() instead of get_var() because of funkiness with 0, false, null values. |
| Line | Code |
| 2102 | } else { |
| 2103 | if ( ! is_array( $notoptions ) ) { |
| 2104 | $notoptions = array(); |
| 2105 | } |
| 2106 | |
| 2107 | $notoptions[ $option ] = true; |
| 2108 | wp_cache_set( $notoptions_key, $notoptions, 'site-options' ); |
| 2109 | |
| 2110 | /** This filter is documented in wp-includes/option.php */ |
| 2111 | $value = apply_filters( 'default_site_option_' . $option, $default_value, $option, $network_id ); |
| 2112 | } |
| 2113 | } |
| 2114 | } |
| 2115 | |
| 2116 | if ( ! is_array( $notoptions ) ) { |
| 2117 | $notoptions = array(); |
| 2118 | wp_cache_set( $notoptions_key, $notoptions, 'site-options' ); |
| 2119 | } |
| 2120 | |